PDF malware analysis — malicious · cc41586c334eb4a4

MALICIOUS

PDF

3.7 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 9e6eff1b2a852e78cb39ddcfd2d48f79 SHA-1: 98ce73f96a0891c3698f5ba6582f8dbe3b808cf6 SHA-256: cc41586c334eb4a47e48f5c66fc34e14475c9eff402300be0d06cc367147f073

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating obfuscated code execution. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript actions and streams, combined with the obfuscation techniques, suggests the primary intent is to download and execute a second-stage payload. No specific family could be identified from the available evidence.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `641c281dd591a00466438ac80c5929dd61c7b12289ad644f795e8c436a9ba0b2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	4252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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