PDF malware analysis — malicious · e47b672119fc5152

MALICIOUS

PDF

3.5 KB Created: 2009-02-14 14:44:45 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: ba0157ec26bb8901ffb7b64dfa67c2eb SHA-1: e178427fc46738fe915e86aed1aa0c8307cc99d5 SHA-256: e47b672119fc51523dd136b47f4ca85f1f5b030b707e02465fa551889fb069bb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. Heuristics indicate the presence of eval() calls and String.fromCharCode, suggesting code obfuscation. The deobfuscated JavaScript is likely responsible for downloading and executing a secondary payload, which is a common attack vector for PDF-based malware. The extracted JavaScript files are included as IOCs.

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` `7b84fbee9e2fdd28dada74f543f0b441d9b9daa12257957cab11161ccad4d804`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7173 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` `32dfbf59ab632269f70ab2e99f7ff6d920279c68745081a08be4741ec71932a0`	deobfuscated-js	PDF JavaScript deobfuscation pass	15844 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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