PDF malware analysis — malicious · b87931050f01bec3

MALICIOUS

PDF

13.4 KB

MD5: 71f7475f5b3451ea9d3e3918b572f2a2 SHA-1: 2a830360ed80c064ab4ca8618520983c932cfb55 SHA-256: b87931050f01bec37fc7d03a3ee551a8a64b7acf5895722b3e860d512ac85826

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link T1059.007 JavaScript/JScript

The PDF file contains obfuscated JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo vulnerability) in Adobe Reader. The JavaScript is further obfuscated using binary-XOR encoding, indicating a deliberate attempt to hide its malicious functionality. The primary goal appears to be the execution of a second-stage payload via the exploit.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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. (matched inside decoded stream)
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_obj0049_000.js` `71ce50ee41aa375dfe461d161b89ceeaa03fd2699b1d8e4a3cacdffbccaa4c61`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `0763c6e73048e30deca834065d9b02da398cd9f62e481cf18a617ddd9f6b1f14`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1336 bytes

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