Malicious PDF — malware analysis report

Static analysis result for SHA-256 1898a62697ec5644…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: fb9f5babf736b92a56541a0e84f60235 SHA-1: 2fc28532f1ae147a3c820c00a96ff5a1450aff1c SHA-256: 1898a62697ec56442b21743704ccfd38fecc346644e189a30bd156ce6c3a0bdb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by heuristics and ClamAV as malicious (Win.Trojan.Agent-36166). The JavaScript appears to be heavily obfuscated but is designed to download and execute a secondary payload. The presence of JavaScript actions and embedded JS streams strongly suggests an attempt to compromise the user's system, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36166
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
65130aec40db8dcc1b2c9f5bd425a9f95a96bc01ab978cdff241f20ed9bd6367		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75046 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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