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ELF Binary Analyzer

Parse and analyze ELF (Executable and Linkable Format) binary files automatically. Supports ELF32 and ELF64 with both little and big endian encoding. Parses ELF headers, section headers with Shannon entropy analysis, program headers (segments), symbol tables (static and dynamic), dynamic section entries (DT_*), and flags packed/suspicious sections using high-entropy detection, known packer signatures, and W+X permission analysis. Free, private, and no signup required.

ELF Binary Analyzer

Parse and analyze ELF (Executable and Linkable Format) binary files. Automatically parses ELF headers (32/64-bit, LE/BE), section headers with entropy analysis, program headers, symbol tables, and dynamic linking information. Flags packed, compressed, or suspicious sections for security analysis. Paste a hex dump or upload a binary file.

Examples:

Paste an ELF binary as a hex dump above and click Analyze ELF to parse its headers, sections, program headers, symbols, and dynamic linking information. The tool also detects packed or suspicious sections based on entropy analysis and known packer signatures. Upload a binary file or load an example to see how it works!

Features

Full ELF Header Parsing

Parses ELF32 and ELF64 headers with little and big endian support. Displays class, data encoding, OS/ABI, machine type, entry point address, section and program header table locations, and all raw flags. Automatically detects Linux, FreeBSD, Solaris, and other OS/ABI identifiers.

Section & Segment Analysis

Comprehensive section header table with type classification, flag decoding (Writable, Allocatable, Executable), address mapping, and size information. Program header analysis shows loadable segments, interpreter paths, TLS templates, and GNU stack/relro properties.

Symbol & Dynamic Linking

Extracts and displays symbol tables (SHT_SYMTAB and SHT_DYNSYM) with symbol names, values, sizes, bindings (LOCAL/GLOBAL/WEAK), and types (FUNC/OBJECT/FILE). Dynamic section parser decodes DT_* entries including DT_NEEDED library dependencies, DT_SONAME, DT_INIT/DT_FINI, and GNU hash tables.

Packed Section Detection

Flags suspicious sections using multiple heuristics: Shannon entropy calculation (>7.5 suggests compressed/encrypted data), known packer section name patterns (UPX, Themida, VMProtect, ASPack, Armadillo), writable+executable (W+X) permission combinations, and unusually large PROGBITS sections.

Use Cases

Malware Analysis & Reverse Engineering

Analyze suspicious ELF binaries for packed or obfuscated sections. The entropy analysis and section flag detection help identify UPX-packed malware, encrypted payloads, and anti-analysis techniques used in Linux malware. Detect hidden code sections and unusual segment permissions.

Binary Debugging & Forensics

Examine core dumps and crashed binary images. Parse program headers to understand memory layout, check interpreter paths, and verify PT_LOAD segment alignment. Identify stripped symbols and analyze dynamic linking for forensic investigations of compromised systems.

Cross-Platform Binary Verification

Verify that compiled ELF binaries target the correct architecture (x86, x86-64, ARM, AArch64, RISC-V, etc.) and OS/ABI. Check endianness, 32/64-bit class, and ABI version to ensure compatibility before deployment across different Linux distributions and embedded systems.

Security Hardening Audit

Audit binary security features including PIE/PIC position independence, stack canaries (PT_GNU_STACK), RELRO (PT_GNU_RELRO), NX bit enforcement, and FORTIFY_SOURCE. Detect binaries without ASLR support or with writable+executable memory segments.

Embedded Systems & IoT Analysis

Analyze ELF binaries from embedded Linux systems, routers, IoT devices, and ARM-based hardware. Verify correct architecture selection, check for stripped debug symbols, and identify dynamic library dependencies. Useful for firmware analysis and vulnerability research.

Education & ELF Format Learning

Learn the ELF file format interactively by exploring real binary headers. The tool visualizes every field of the ELF header, section headers, program headers, symbol tables, and dynamic entries. Great for computer science students learning about binary formats and linkers.

About ELF Binary Analyzer

What Is an ELF Binary?

ELF (Executable and Linkable Format) is the standard binary format for executables, object code, shared libraries, and core dumps on Unix and Unix-like systems including Linux, FreeBSD, Solaris, and many others. First published in the System V Application Binary Interface specification, ELF replaced older a.out and COFF formats. Every ELF file starts with a 4-byte magic number (\x7FELF) followed by a header that defines the file structure, including section and program headers that describe how the binary should be loaded and linked.

How the ELF Analyzer Works

The analyzer parses ELF binaries from raw hexadecimal input or uploaded files. It extracts the ELF header to determine architecture (32/64-bit), endianness (little/big endian), OS/ABI, and file type (executable, shared library, relocatable object, or core dump). Section headers are parsed to reveal code, data, symbol tables, and string tables. Program headers describe how the operating system loads segments into memory. The tool also computes Shannon entropy for each section to detect compressed or encrypted content, cross-references section names against known packer signatures, and flags suspicious permission combinations.

Packed Binary Detection

Many malware samples and commercial software use packers like UPX, Themida, VMProtect, ASPack, or MPRESS to compress or encrypt their contents. These packers leave characteristic traces: high-entropy sections (>7.5 bits per byte), suspicious section names (.packed, .upx0, .themida), or unusual section permissions (writable + executable). The ELF Analyzer automatically scans for all these indicators and presents them in a dedicated Suspicious Sections tab. High entropy is highlighted in red, known packer names are flagged, and W+X sections are marked for immediate security review.

Privacy & Security

All analysis is performed entirely in your browser using JavaScript. Your ELF binary data never leaves your device. There are no server uploads, no API calls, and no data collection. This is particularly important when analyzing sensitive binaries such as suspected malware, proprietary software, or confidential internal tools. You can analyze as many files as you need with no signup, no accounts, and no usage limits. The tool supports both hex dump pasting and direct file upload for convenience.

Related Binary Analysis Tools

Mach-O Binary Analyzer

Parse and analyze Mach-O headers, load commands, segments, and symbol tables for macOS/iOS binaries.

Binary Data Unpacker

Detect and unpack obfuscated binary data automatically. Supports Base64, hex, XOR, GZIP, and more with confidence scoring.

Entropy Analyzer

Compute Shannon entropy of binary data to detect encryption, compression, and obfuscation with byte frequency analysis.

Hex/Binary Converter with XOR

Convert between hex and binary. Apply XOR, AND, OR, NOT operations with customizable keys and cumulative XOR checksums.

Frequently Asked Questions
What ELF binary formats does this tool support?
The tool supports both ELF32 (32-bit) and ELF64 (64-bit) binaries with both little-endian (LSB) and big-endian (MSB) data encoding. It can parse executables (ET_EXEC), shared libraries / PIE binaries (ET_DYN), relocatable object files (ET_REL), and core dumps (ET_CORE). All common architectures are supported including x86, x86-64, ARM, AArch64, RISC-V, MIPS, PowerPC, and SPARC.
How does the entropy-based packed section detection work?
Shannon entropy measures the randomness or unpredictability of data. Normal code sections (.text) typically have entropy between 4.0 and 6.5. Compressed or encrypted sections (like packed executables) have entropy close to 8.0 (approaching maximum). The tool computes entropy for every PROGBITS section and flags any section with entropy above 7.5 as potentially packed. Entropy values between 6.0 and 7.5 are highlighted in amber for attention.
What packer signatures does this tool detect?
The tool flags section names matching known packer patterns including .packed, .encoded, .crypted, .obfuscated, .protect, .vmprotect, .themida, .enigma, .mpress, .upx0, .upx1, .upx2, .aspack, .armadillo, and .pecompact. It also detects sections with W+X (writable + executable) permissions, which are unusual in normal binaries and indicate potential code injection or packed code that self-modifies at runtime.
Can this tool analyze stripped binaries?
Yes. Stripped binaries lack symbol tables (.symtab section), which means the tool will show fewer or no symbols in the Symbols tab. However, the ELF header, section headers, program headers, and dynamic linking information are always preserved in stripped binaries and will be fully parsed. The tool can still detect packed sections, analyze memory layout, and verify security features on stripped binaries.
What is the difference between section headers and program headers?
Section headers describe the logical divisions of an ELF file (code, data, symbol tables, debug info) and are used by linkers and debuggers. Program headers (also called segment headers) describe how the kernel or dynamic linker should load the binary into memory at runtime. An executable typically needs both: section headers for debugging and linking, program headers for execution. Stripped executables often retain program headers but remove most section headers.
What security features can this tool detect?
The tool detects PIE/PIC (Position Independent Executable via ET_DYN type), PT_GNU_STACK for NX bit enforcement, PT_GNU_RELRO for read-only relocation sections, PT_INTERP for dynamic linker path, stack execution permissions from program header flags, and writable vs executable segment separation. A PIE binary with NX enabled and full RELRO is considered well-hardened against memory corruption attacks.
How do I use the hex dump input format?
Paste the raw hexadecimal representation of your ELF binary. Spaces and 0x prefixes are automatically stripped. You can obtain a hex dump from a binary using xxd (xxd -p binary.elf), od (od -A x -t x1z -v binary.elf), or hexdump. Alternatively, use the Upload Binary button to load a file directly - the tool will automatically convert it to the required hex format.
Can this tool analyze obfuscated or anti-analysis ELF binaries?
The tool can detect many common anti-analysis techniques including packed sections, encrypted code regions, W+X memory segments, unusual section names, TLS callbacks, and stripped symbols. However, it cannot execute the binary or bypass advanced anti-analysis techniques like virtual machine detection, debugger traps, or runtime code decryption. For dynamic analysis, use a debugger or sandbox environment.
Is this tool completely free to use?
Yes - 100% free with no signup, no account, and no usage limits. Analyze as many ELF binaries as you need. There are no premium tiers, hidden charges, or rate limits. All processing happens locally in your browser using JavaScript - your binary data never leaves your device.