Malicious PDF — malware analysis report

Static analysis result for SHA-256 470b3d206cdf1340…

MALICIOUS

PDF

4.4 KB Created: 2009-08-23 19:47:07 Authoring application: Ela 2.6.6.3 (via PDF Library 4.8.1.5)
MD5: 4c880260d258f6b816bda662eba5b990 SHA-1: 578f3d953b0da1be1902be95edb2f9c986778a46 SHA-256: 470b3d206cdf13406a7eece80692044fad0004c3fe54adb7fc3e0f81db65338a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections for 'Pdf.Dropper.Agent-1828728' and 'Pdf.Exploit.Agent-35794' on the main file and an extracted artifact respectively, strongly suggest it's a dropper or exploit. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malicious PDFs.

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-1828728 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1828728
  • 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_obj0014_000.js
d7fdb3da6c8a521324d0f9239ccef1fd0b3e25b48c892725db708a4df9a21835
pdf-javascript-stream PDF /JS object 14 at offset 0x398 42889 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35794
Obfuscation or payload: unlikely