PDF malware analysis — malicious · db9cb5874cc40022

MALICIOUS

PDF

12.7 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 57ff70d4c57d54425c778154cc88544a SHA-1: a9b50bba06b032979977fa8fc936a53dec0c57e5 SHA-256: db9cb5874cc40022d0946267cb8ad38d471769991c5dd391089e2c9a8e29cd53

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 and PDF_JS. The JavaScript stream, named 'javascript_obj0013_001.js', is heavily obfuscated using techniques like String.fromCharCode and unescape(), making its exact function difficult to determine. However, the presence of these obfuscation methods and the 'Suspicious extracted artifact' heuristic strongly suggest the script is designed to download and execute a secondary payload. The authoring application and creation date appear to be fabricated.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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` `4c7ea7f176908232ea5b68eee7d618cd00f9daa0695c263d9f0e28d9be8af1f4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x38C	11462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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