PDF malware analysis — malicious · fe6ea0abdffbc045

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: faaf49bbe55983ece649fa11a4a17df5 SHA-1: f55eaa1d3384e264ae5609bea74739ad95d13f32 SHA-256: fe6ea0abdffbc045d67a3b902c4082b371bf4af2c34ff010f162821152d0fa70

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as Pdf.Dropper.Agent-7328916-0. Heuristics indicate the presence of JavaScript actions and embedded JS streams, with evidence of unescape() and String.fromCharCode() calls, suggesting obfuscation. The primary attack pattern involves leveraging JavaScript within the PDF to download and execute a secondary payload, as indicated by the ML classifier's high confidence score and the nature of dropper malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7328916-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7328916-0
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` `78811d732483cd57651b9c8bcc826690be623ac50fab6f6718ca2482779271d4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11172 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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