PDF malware analysis — malicious · 9f3f1a2597f00be4

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 2476 (via 2476 1.1)

MD5: a0e316717890b899d53d0e43e0cd5196 SHA-1: a154430e2b8536539bd9fc6cc40b7d1d6d14e1f8 SHA-256: 9f3f1a2597f00be45d757612ce393396f178a90d465cec9b0c2cab10dc28c4aa

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and unescape() calls within the JavaScript stream suggests obfuscated code execution. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves leveraging JavaScript within the PDF to likely download and execute a second-stage payload, although the exact mechanism is obscured by the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `274e6644f5ffc6dc2a5d08dfbc7ab8301c57d1d424ec67a1854d4e1f23c25476`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	72874 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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