PDF malware analysis — malicious · cd26b4187b053a80

MALICIOUS

PDF

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

MD5: 15008b99cded5600932aaf6411e65a5d SHA-1: 1a805a1c438103058bad497ebc51bef58fe4b217 SHA-256: cd26b4187b053a80d6a497f5657455730ae7943dc2b1378a2cad3f6b1fd4d8f5

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of an eval() call (PDF_EVAL) and a high ML classifier score (ML_NYX_PDF_MALICIOUS) strongly indicate malicious intent. The JavaScript, extracted as 'javascript_obj0013_001.js', is likely responsible for executing the malicious payload, though its specific actions are obfuscated. The file's metadata indicates it was authored using Scribus.

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` `94d19a38cffd8691ed203d053d34c492d4506580ee9452af25d433f8394f44ba`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	6386 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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