PDF malware analysis — malicious · ecc2f13f9058070f

MALICIOUS

PDF

9.9 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: febc54933ca474d78e6ef0a1d780d1c2 SHA-1: 7fbb46c2fd02f702a60859fb2533ee403f86657a SHA-256: ecc2f13f9058070fa6684bdc9add1472a070db2c325f973972aa934647517d3e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is obfuscated using unescape() and String.fromCharCode, indicating malicious intent. The ML classifier also strongly flagged this PDF as malicious. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as suggested by the obfuscation and the nature of the extracted artifact 'javascript_obj0013_001.js'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_001.js` `e7384c97ff4110cf67289720f7e4f483a8a1d652f8d174d17bd931df194f4084`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11603 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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