PDF malware analysis — malicious · 955431ef57bb640e

MALICIOUS

PDF

4.7 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 36e4d0cb3bf54d7bf25b3691d745cd81 SHA-1: 3be407e69feeb265066992693a5b860d8cc63749 SHA-256: 955431ef57bb640e0add7de05f503f8aaf6fab46e2fe87e102b10961ee61a3c2

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-severity PDF_EVAL heuristic firing suggests that the JavaScript is likely obfuscated and uses eval() to execute arbitrary code. The ML classifier also strongly flags this PDF as malicious. The extracted artifact 'javascript_obj0013_001.js' is likely the source of this malicious JavaScript, which is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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` `957da8b2f0487e97cac474537e54426a6049a677f9590f8f7d5f8041001fccb8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	6366 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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