Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d50aaccc7e639cf…

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: 45e4bdd9ab1d5703014754d3d1ffc497 SHA-1: cd1979dd03b703e4d92e1eab2e059c3338b724cf SHA-256: 6d50aaccc7e639cf546de967cf41f183534499a73a8250f0684c4fff094b317d
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple engines, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. Static analysis revealed embedded JavaScript, which is commonly used in malicious PDFs to download and execute further stages. The JavaScript appears to be obfuscated, but its presence strongly suggests a downloader or dropper functionality, consistent with a spearphishing attachment attack vector.

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
12be84f1437efb32f49e0ac6715f36aa29164015c73348711d46cf58ebdd015d		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74889 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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