PDF malware analysis — malicious · 39cf1ab96ae00921

MALICIOUS

PDF

10.7 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 32cfcb5dd2bac1fa7ad5ed7b55624b55 SHA-1: 4019c5febb85e8853d0b2931a492bf102ef24c9c SHA-256: 39cf1ab96ae00921b19b6f3a57c13799fd958dad0aca4bc1631ac52265e0ac35

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0013_000.js', is likely responsible for downloading and executing a second-stage payload, as suggested by the 'eval()' call and the ML model's high confidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_000.js` `8c5a3d4c6cb057b68b4ea4bd44e4ae1ca2aae0c6aa31b42e13cee30e4a7c0e4c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x336	9404 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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