PDF malware analysis — malicious · 9b8dc99533f9b230

MALICIOUS

PDF

2.0 KB

MD5: 545f3ab8f5cdaf0a6b2989a52ad6345b SHA-1: d79cd1a6e3a6560ff2436d7ea2a47420ca861241 SHA-256: 9b8dc99533f9b23068d8a4cb07a3b8dcc2d89286c1e12d08c5808f8f9acc8438

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that utilizes the `Collab.collectEmailInfo` method, a known indicator for the CVE-2007-5659 vulnerability. The JavaScript is obfuscated using `unescape()` and `eval()`, and the ML classifier strongly flagged this PDF as malicious. ClamAV also detected it as `Pdf.Exploit.Agent-35930`. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, although the exact URL or mechanism is not directly extractable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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: Pdf.Exploit.Agent-35930 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35930
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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_obj111611_000.js` `f23e505f155bfa9b9f356fa9fddf8d7fcafcc37fc2df3878e575e72c00c819d4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x6CE	697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `aee065673133d2eccabd6bc7d4be2d21d895eb1f1954124fc0b82f5bd200c84a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2622 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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