Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b390e825567b7e…

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: e7ee321cdf273d432079a49b7b537e22 SHA-1: d00c9da4ec371a7d0106ab579eee3479ab4a4cb9 SHA-256: c1b390e825567b7e16cc2016bea93b3758a3da1ea83cfc5378ee8374a7bf612b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, suggests an attempt to execute malicious code. The ML classifier also strongly indicated maliciousness. The extracted artifact 'Win.Trojan.Agent-36166' is the primary IOC.

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
0b50692165eac75be99f546e6cd0c0da278776ad592984367daaf2559e3a1100		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74384 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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