Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5656a4dce16bcf…

MALICIOUS

PDF

27.7 KB
MD5: 2aad57cde4afe29c076ea42a7b97dd55 SHA-1: 8dfcd32f8c3773228f7079ffee1b93523f15f1f1 SHA-256: de5656a4dce16bcf43432beb6b82fc74a289b1f1d4967dcb68819a139ead9049
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 (Win.Trojan.Agent-36100) on both the main file and an extracted artifact confirm its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested 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
30dc733197558a4ec3b919c70de3362c4f5af84f71de3a0e5923bd0f934b74ae		 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
0efe10141fbe08e1a0077ae6dd15cac475ffc0664a5af1d1102026b251d061d9		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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