Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab979d86cf2e14b…

MALICIOUS

PDF

27.7 KB
MD5: 58f1c534ed30ed523162d49c468dbfb7 SHA-1: e26d22f3512c01f446e2b0d92ebddf16146f3468 SHA-256: fab979d86cf2e14bd7b1185ee42d25e29784e10add2cf71f8ca3398b5236c724
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings. The ClamAV detection '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. However, the exact functionality of the script could not be fully determined due to 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
24dc423db2b388410442b67090a70dd610f7a5fbeeb61a3041d4921a01b928da		 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
d2ae653e9cc6a671828b75189e08d14e7e10860f6fa00399eecb2c2e71095e56		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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