Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5592d46dada5a2…

MALICIOUS

PDF

27.9 KB
MD5: 62bff82fc937277c9ad98e29ca46368b SHA-1: 951cb7675a25f5bda3f2555a6d976378c087c3d6 SHA-256: 2c5592d46dada5a26a7bc72576a105bbb10e16eb47f7b96242f370ac0c8cb51a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded and obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ClamAV detection of 'Win.Trojan.Agent-36100' on both the primary file and an extracted artifact strongly suggests a malicious payload. The JavaScript is likely responsible for downloading and executing this payload, aligning with common techniques for delivering malware via malicious documents.

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
6b5d69d280c75fd92bd9dd22751c1c89c14aa517a69254ca8cc96399193a4189		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27765 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
aacfec3f1e4855d4493687a60bb800cb44c1cd03a659618624b9011d3d7604de		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15261 bytes

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