PDF malware analysis — malicious · 3765fbdf1b3b2a7b

MALICIOUS

PDF

76.5 KB

MD5: 64cdd5cedb0c946348431f9743022de6 SHA-1: 9bcfe41d12352fa31698ec7e70a3b2af9a2e8e83 SHA-256: 3765fbdf1b3b2a7b7f60e0dbb7a955de08185be3272ecf2128a30051e5702170

256 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that utilizes a binary-XOR stager. This stager decodes further JavaScript, which then exploits CVE-2007-5659 via the Collab.collectEmailInfo method. The exploit is designed to download and execute a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-7249261-0' ClamAV detection and the ML classifier's high confidence score. No specific family could be identified, but the exploit vector is clear.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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: Pdf.Dropper.Agent-7249261-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7249261-0
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` `ebfaf324d950200365f49f8c4142986be7e13742b9b71354d7b2a4727047cb5c`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	78010 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` `917ba7577903ac8dae9ca9258383ec500ee979df2b82480b8a9f01796bebe57b`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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