Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f270c99a4128326…

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: c9d0b6b03fdae10982246dc955e2a599 SHA-1: aab512fcf8989084fa149147edf5a395d3c7b89b SHA-256: 0f270c99a4128326353cc6701fb12273d4849827d1110a57646cc2688a802657
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection (Win.Trojan.Agent-36166) and an ML classifier. Embedded JavaScript was extracted, which is highly indicative of a downloader or exploit execution. The JavaScript code appears to be obfuscated but its presence and the PDF's nature strongly suggest it's designed to fetch and run a secondary payload, likely exploiting a vulnerability or luring the user into further interaction.

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
d6526f3ce3c1455e12fbcb5aa1f51882cff1e6bfc6db177f2be0a133792c19b5		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74697 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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