PDF malware analysis — malicious · cb5fc35d8dcb2d2c

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: 824c425666b76458cc3731a52b26c0fa SHA-1: 378c80c9851b6bb03c44567704954222fa780e21 SHA-256: cb5fc35d8dcb2d2cf63f6f6d696fbaa795917ae38c09f74f60be71c38aef325b

144 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The critical ClamAV detection and multiple PDF-specific heuristics indicate a malicious PDF. The presence of embedded JavaScript, including unescape() and String.fromCharCode calls, suggests an attempt to obfuscate and execute malicious code. The extracted artifact 'javascript_obj0013_001.js' further supports this, with signals of hex escape and script obfuscation. The overall pattern points to a PDF exploit designed to deliver a secondary payload.

Heuristics 6

ClamAV: Pdf.Exploit.Agent-7096 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-7096
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` `feca2d0120f4a60586828ceca20e1cf158f0ac1b14b5be2d0d04bc494296e81d`	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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