PDF malware analysis — malicious · 4d24d7ca01067a22

MALICIOUS

PDF

3.2 KB Created: 2008-09-02 15:29:36 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1dc36d272c7563774e0c6a86677900d1 SHA-1: 95cfb200f9597c50e52dc951ee7e72f378792c48 SHA-256: 4d24d7ca01067a224af05a0cf5b42258d0e769dd8dc2da32cf284c63e962734d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of eval() and String.fromCharCode suggests obfuscation, and the ML classifier strongly flags it as malicious. The deobfuscated JavaScript is likely responsible for downloading and executing a secondary payload, which is a common attack vector for PDF-based malware. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `73a60c82b9ae792c798cd67e10662e9e4db2e7e597ffed31ebd55f88ec7ff972`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5479 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).
`deobfuscated.js` `3a2a6be4dd778ec045e688d0f147a0ddb07fecdb523f1be0bf3ac3b6920c079a`	deobfuscated-js	PDF JavaScript deobfuscation pass	11678 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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