Malicious PDF — malware analysis report

Static analysis result for SHA-256 4714d1cd5a8eaa70…

MALICIOUS

PDF

27.6 KB
MD5: 37fccbfe9180e58b8ae78f57346ff741 SHA-1: 15efd709ab3f1405deb01471e616d48e6594b544 SHA-256: 4714d1cd5a8eaa707abc9acf3ebafb8b9403adb5fae7f2b6ef5c4487f72cc4e3
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 primary file and an extracted artifact confirm its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is 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
0ecd450bb4d3be69cf04d2dbf638a8a4121b261efc9e7b13fe5d1c795ec15249		 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
b3698d860da48f815609ff321d72d560e38633550f944730d6cc6d4974ce711a		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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