PDF malware analysis — malicious · c771de817aee5feb

MALICIOUS

PDF

3.4 KB Created: 2008-12-16 19:53:01 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 16e972fe28b8676d2aa875afc33debdc SHA-1: e609ec3f800b08d9a3c1fb62283bd0e2c7b8de37 SHA-256: c771de817aee5feb33b8436e626c866f7a5d483b9d5cacc3125b0c17547d73fe

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The presence of an 'eval()' call and 'String.fromCharCode' within the decoded JavaScript stream suggests the execution of obfuscated or dynamically generated code. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves exploiting PDF vulnerabilities to run malicious scripts, likely to download and execute a second-stage payload.

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` `28d1811649434b299346fd8eb1cb4fac1cc42ff646ea8283dd6f8246e45df19a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7185 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` `4452418b2343cf131305b7bf97ba874442cc17134dcb62cc1568b9443b97a2d5`	deobfuscated-js	PDF JavaScript deobfuscation pass	15616 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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