PDF malware analysis — malicious · 1bd39a431508645b

MALICIOUS

PDF

3.1 KB Created: 2009-05-31 15:33:12 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 2a084a80f466361d7002c702bfbedb63 SHA-1: 6ef0efbd269eaac72e87c979c601393e3acb0dba SHA-256: 1bd39a431508645bf2b421f402690f5d24e02c1717297e62e06d22d8712476da

98 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. Static analysis revealed embedded JavaScript streams, including one that utilizes `eval()` and `String.fromCharCode()`, indicating obfuscated code execution. The presence of deobfuscated JavaScript further supports the conclusion that the script is designed to download and execute a secondary payload. The exact nature of the payload and its delivery mechanism cannot be determined without further dynamic analysis.

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` `349c1b8f3936e04d3c0b3fafb0b15b7b409ea12cffdd5f38fcb26e0942a1a247`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	4785 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` `308cd387baf725f349aa8323f3f3706f1abd0f5b21ed6c2cb2d162995c07fe5d`	deobfuscated-js	PDF JavaScript deobfuscation pass	11000 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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