PDF malware analysis — malicious · daaccbca47870b5a

MALICIOUS

PDF

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

MD5: 5c4efb069b4bbdbfc8a4a105a25f725a SHA-1: 1b8f4e0d65bf9ce40c3338d490ebe233fefa86a3 SHA-256: daaccbca47870b5a1339996572413f9cd442e14d7f3ac109527b7b8c11384d1c

126 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 is obfuscated using unescape() and String.fromCharCode, making its exact function difficult to determine statically. However, the presence of these obfuscation techniques and the ClamAV detection (Pdf.Dropper.Agent-7311835-0) strongly suggest that the script is designed to download and execute a malicious second-stage payload. The file's authoring application and creation date are from 2009, suggesting it may be an older, but still functional, dropper.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7311835-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7311835-0
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` `9dcaffeba9d6de281829e43e12f630f01359752cbbdd7bcdbc93bb2230907958`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11555 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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