PDF malware analysis — malicious · e6433ef7bf03e78c

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: 6e8e6671ca6c56f22af01b5d1bc00d75 SHA-1: ecb7ea97f29224ffa7b27927ae40cf6f207d0002 SHA-256: e6433ef7bf03e78cedca5f37e162800d9d3ae72787eff387d1bd6f73320d03cd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The JavaScript stream, identified as javascript_obj0013_001.js, is heavily obfuscated, suggesting an attempt to conceal its malicious actions. The presence of String.fromCharCode and unescape() calls further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact details are obscured.

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` `0c3b7c3b8304a5e5942d8fae7f9d711182b1a9d39b4317bc68ccd7fc67f5ed69`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11951 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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