Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce89851b2e428d5…

MALICIOUS

PDF

27.7 KB
MD5: 7afd6eac586c9bb92c1ac7cfccf1aabc SHA-1: 1d6435ccff22575b300b8881d38f74ec3efc174f SHA-256: 4ce89851b2e428d5c73a7e899524dedc50792935c1d064154c9b9c79abefdf70
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. ClamAV detections confirm the malicious nature, identifying it as Win.Trojan.Agent-36100. The embedded JavaScript is likely responsible for exploiting vulnerabilities or delivering a secondary payload, contributing to the overall malicious intent of the document.

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
9a1b7af31658ba6ead0e3dffcaa9b5b77c08b5a5a97d17d0f4e6b8b87fe1715e		 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
95954db68743c8eda0cab92c0404e932a7d3d4bc6cfd28ee2f58b4e6527b7ee6		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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