Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cac7e8fbd1364f…

MALICIOUS

PDF

27.7 KB
MD5: 926660faa954d8990dc11be10faae2a6 SHA-1: 165ae9738634b5b8c712b3c70b18a2f542691227 SHA-256: 31cac7e8fbd1364feffc70b87b5b27558760554532677677c17e971d001e263d
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36100) confirm the malicious nature of the file. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of large JS streams and the ClamAV detection name which often implies a trojan downloader or agent.

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
e142e7fb5e06acd0636ae5542fc817a2580e961de31c7cec19273c62abf5459d		 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
58e236954e39fcca932fe3c592051f0cb6b5143d7cbb5f90ac6eebbffefcebfb		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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