PDF malware analysis — malicious · b3bf3b010376ed95

MALICIOUS

PDF

6.4 KB Created: 2009-10-25 20:35:22 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 2caf38abbcddf468508f619487303781 SHA-1: 9680e9abd7096dd25c06b28ff095a7c8f787edee SHA-256: b3bf3b010376ed95f8eb2cae1f13be1931e2e820369aac756aa5c2f96b474864

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated using unescape() and String.fromCharCode, suggesting malicious intent. The heuristic 'Suspicious extracted artifact' flags 'Script obfuscation indicators' and names the extracted file 'javascript_obj0013_001.js'. This script is likely responsible for downloading and executing a second-stage payload.

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` `d35ce462de08e93a2f79f48a2724fdf0d675c7c1cbed2b20b355d1c7fb5fba0e`	pdf-javascript-stream	PDF /JS object 13 at offset 0xC11	11101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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