Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53485643bfe209f…

MALICIOUS

PDF

27.7 KB
MD5: c3fa9f35f1be4b8bc5b19bd9a3d3dd2f SHA-1: 0b1106bbc4fd5978fad1f4bc329d0f94bb92ad6f SHA-256: a53485643bfe209f23f34261adbfbcbc1de2e381d8feb90b96b4f97307f11588
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 confirm the malicious nature, identifying it as Win.Trojan.Agent-36100. The embedded JavaScript is likely used to exploit vulnerabilities within the PDF reader or to download and execute a secondary payload. The document body content is obfuscated and does not provide clear user-facing lures.

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
81fc3d6c2b1afd4f4a073d6c4310ace39be66183bbd4b92bc293ef5e656da711		 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
a6821b56058d65e1e56666d0a5b9531367d7e08de248b293b894df4da692c9dd		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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