Malicious PDF — malware analysis report

Static analysis result for SHA-256 256b7ec5f9600e0a…

MALICIOUS

PDF

27.7 KB
MD5: 637474ba66f55852f29df2aeed83af30 SHA-1: 339350e259f84608dff5fabaadd987e82b676d60 SHA-256: 256b7ec5f9600e0ab80a54734fd2e60ceee6692b8e797bc55fc0705c53b3a76f
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36100) on both the main file and an extracted artifact confirm its malicious nature. The JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection name.

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
c477eedff0d38f02d7e38cf5ce7c8cb32a7cc951cc09532bcda17a1641958fae		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
5d6d4a85b0c1840696f81161d0fb01cc839a11c8fae8c9a88ec98ffa04d525a6		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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