PDF malware analysis — malicious · 1c2a380dc9baf079

MALICIOUS

PDF

9.8 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 747923f4a9c3f0348d7260949e538fab SHA-1: fc23220345586b7410796a9dd26d4b2f3af2a996 SHA-256: 1c2a380dc9baf07994ff463fc63eb050dd2c63459524ea948f1bedbd71b0f3ed

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The critical ClamAV detection and multiple PDF-specific heuristics indicate malicious intent. The presence of embedded JavaScript, specifically using unescape() and String.fromCharCode, suggests obfuscation to hide malicious code. This script is likely responsible for downloading and executing a secondary payload, as indicated by the 'Suspicious extracted artifact' heuristic. The file type and obfuscation techniques are common for PDF-based malware droppers.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7235821-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7235821-0
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` `c79c191b7686b4d7867fbcf671f8dd0d7c8f49c0d8a9e7893d22f5a80998c70d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11774 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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