PDF malware analysis — malicious · 8c130715b9f64d43

MALICIOUS

PDF

10.0 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: df27356da5311fa7787b637d4c524ab8 SHA-1: 82b4d664d2014e3244fa3b5180a0cc7172286b3a SHA-256: 8c130715b9f64d4369ce2fc2e03c3b8c00d075744baff3f322589fb454435cb5

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by the 'unescape()' and 'String.fromCharCode()' heuristics, and flagged by ML classification. The presence of a JavaScript stream and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly suggest malicious intent. The extracted artifact 'javascript_obj0013_001.js' is likely responsible for executing the malicious payload. The obfuscation and lack of clear indicators for a specific family lead to an 'unknown family' classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `183e114d69e58357642870b8fb96833f1dbf5b3f4144e07e2e3a7a33921dba42`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	13193 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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