PDF malware analysis — malicious · 3cbbaf7ec056e08a

MALICIOUS

PDF

7.1 KB Created: 2009-11-12 18:17:06 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 3f5cc2683c641f9f9b81ad6fb653c9dc SHA-1: 38594afbd1257f14fef3678acf310ace63f9ee4a SHA-256: 3cbbaf7ec056e08a980bbdd0856806ea540c2a1bd0c1a6107bf66e9e7bed0525

84 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, identified as javascript_obj0013_001.js, exhibits obfuscation techniques such as unescape() calls and String.fromCharCode, suggesting it is designed to hide malicious activity. This script likely downloads and executes a second-stage payload, contributing to the overall malicious nature of the document.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `4646bfe67d78c35bb0b01f7636be153411dcf619f28eac0f19cce9fd54bfcf50`	pdf-javascript-stream	PDF /JS object 13 at offset 0xF03	13419 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).

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