Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b68de29f481ade…

MALICIOUS

PDF

27.8 KB
MD5: 5799f4bfda6b36f8711d67ae8d88b272 SHA-1: 6f58c2692b3d53fb2eef208bf4b8d29e8a3414b3 SHA-256: 23b68de29f481ade854c3b991a218f28f3c9b007939e10672a73042724788469
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 JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of deobfuscated JavaScript code.

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
b570513317003d6624d288d07fae56a06efeb15718791dca27bb9840775efb26		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27717 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
a81d1f52b9d6dcafead0f07d2df651c1452e3c58f9b7498eea208a7f3378953d		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15237 bytes

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