PDF malware analysis — malicious · cea333a9ef17ba81

MALICIOUS

PDF

3.2 KB Created: 2008-10-08 03:32:20 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 3147a2bacd1080e6b4bf1c1a99de080f SHA-1: 8d9f48535f40bd466f991d898aacdbb39a695366 SHA-256: cea333a9ef17ba81feca1a6d648236c4f94768f3437a95fc1268337560d9bbdc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, including obfuscated code that utilizes eval() and String.fromCharCode. The presence of these techniques strongly suggests the script is designed to download and execute a secondary payload. The obfuscation and use of JavaScript point towards a common delivery mechanism for malware.

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` `8818610c8c8229ef0c55403a83ec80e6e3658816a608e329b66a5d2baaa4ff61`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5426 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` `b09ab1bb025d4e8b838dc2f2ddce1b09c5ba16233559634bf9d4ca9bdeaac188`	deobfuscated-js	PDF JavaScript deobfuscation pass	12609 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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