Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a891ead2c4db146…

MALICIOUS

PDF

27.7 KB
MD5: 265ebbd61cb3643a0fa1a2d672957d49 SHA-1: 19afe783bb1abef14443045da5e8f5ca55fd36a5 SHA-256: 9a891ead2c4db1463dd685b31cf55ed4a5f532a728adec555508df876d17ce24
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. The ClamAV detection of 'Win.Trojan.Agent-36100' strongly suggests malicious intent. The embedded JavaScript is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload, though the exact functionality is obscured by obfuscation.

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
17bfb9f181b1904c4cb14882e322c736f8a991e16033586323330d24c3c0f5f2
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
e3750603a5fd6dd57ee9745ff21c4a5e3416f68ff679c022ee06ff90bd7277b4
deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes