PDF malware analysis — malicious · 1bf3fccd2507e4b3

MALICIOUS

PDF

74.7 KB

MD5: 1faafb48e9a1c3e506e2c10e23f5efba SHA-1: 9b66d116af9f4feed03b088e0f956d496cd20895 SHA-256: 1bf3fccd2507e4b3412ccbf7849fb57b8825c44b65bfc0c88f59a451d9144093

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, including a binary-XOR stager that decodes and executes a second-stage payload. The critical heuristic firing indicates exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, which is a known vulnerability in Adobe Reader. The JavaScript is designed to download and execute further malicious content.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `0ae34e4521fda911d1d7ea4c569a0b49943d61262faa02751ed6445a5f94d7ad`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	76181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `0d891a651370ca5b4f48a97d6ef2de6e0224aa6b9569968b2141a55f9a0b862c`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x65AE	1237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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