PDF malware analysis — malicious · 21e1e5bdf7717417

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: 82f03cf16176ca48e0103702c5389785 SHA-1: b76eb54d22aebaf84b2f10e216abb67a0b039d12 SHA-256: 21e1e5bdf7717417c3d1ad72d17967240fbe127ca32ce62f44f0610da4ec8950

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-3552. Static analysis revealed embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of unescape() and String.fromCharCode functions within the JavaScript stream suggests obfuscation and potential execution of a malicious payload. The extracted artifact 'javascript_obj0013_001.js' further supports the presence of script-based malicious activity.

Heuristics 6

ClamAV: Pdf.Exploit.Agent-3552 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-3552
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` `a1a8156c4383bd2685dae6fa1e8ccfa3a1b8a541527936bbde6ab4fb40f51d93`	pdf-javascript-stream	PDF /JS object 13 at offset 0xC11	11209 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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