PDF malware analysis — malicious · fcf86e5b4d5dc7da

MALICIOUS

PDF

7.2 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1e9a09669b79c8cace9fe54c5e9269e1 SHA-1: c749aec2caa7add54be8be80915ab25472f5a8e9 SHA-256: fcf86e5b4d5dc7da9b271c8eb6c1ddc6fbc00482325ef9d5ee5baa6853172c5d

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript with multiple eval() calls, indicating obfuscation and malicious intent. The ML classifier strongly flagged this PDF as malicious. The JavaScript appears to be designed to execute further code, likely to download and run a second-stage payload or exploit a vulnerability. The presence of 'Scribus' in the document body is likely a lure or misdirection.

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_001.js` `aeefa36e2be0f2873740d1afc3902d28d072c3275b34ede9c918ef00b7c321a9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D5	5763 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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