PDF malware analysis — malicious · 9f5f9fc8a51ed5c3

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: 57b373d5334a318d798ed411928b9557 SHA-1: c074a24acdeed21a30ed00452c867da04067578f SHA-256: 9f5f9fc8a51ed5c36f423c03f85723449d46866c06c3a7f0d8681bb2f05c49a9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple heuristic firings related to JavaScript execution and obfuscation, including the use of unescape() and String.fromCharCode. A critical ClamAV detection identifies it as Pdf.Dropper.Agent-7287659-0. An embedded JavaScript file, 'javascript_obj0013_001.js', was extracted. The presence of these indicators suggests the file acts as a dropper, likely downloading and executing additional malicious content.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7287659-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7287659-0
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` `9a66cc79cf51f9ac9b7b37e5276456556ffdf126704662473bb2ee669ef414a4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11781 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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