Malicious PDF — malware analysis report

Static analysis result for SHA-256 730265aa7a6ff170…

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: b9e474157480691229c35fd87587fa03 SHA-1: c37fead7e08cb84a76ee741ed8f04c6d4b74bb3c SHA-256: 730265aa7a6ff17070f32eaacbc66411b716632875d4dac96d391830746fb17f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Dropper.Agent-7685791-0' and an extracted artifact also flagged by ClamAV as 'Win.Trojan.Agent-36166'. The embedded JavaScript, though obfuscated, is designed to download and execute a secondary payload, indicating a dropper functionality. The presence of JavaScript actions and embedded JS streams points to T1059.007 (JavaScript) as the primary execution method within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7685791-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7685791-0
  • 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
02c1bbe45445dbce8eb95291f6183f805101497fe6960586c637f2c18362fedf		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74351 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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