Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02458da87802561…

MALICIOUS

PDF

27.6 KB
MD5: aa3e069e804a73473f4d35f3e087105d SHA-1: 6017ab944909d5f1fe0f633390e694cf36e92439 SHA-256: c02458da87802561ca7fd38b8541a46fc383a003a7c61443ffd50a087a835a33
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 secondary payload, a common technique for malware delivery.

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
62509f7afe03e623e83ac3c2015571e8c700a449dcddc29872bd0e5e4153f8f2		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27477 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
40017ed6cf35d96f8c1057bcd1325496fe463d314b635958e0f13468c7e59e62		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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