Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d14302de816687…

MALICIOUS

PDF

27.6 KB
MD5: ea822cf89fbd72c4013c3d77a268148e SHA-1: d3e5d2851921637144df58571b92c7f96b0fb444 SHA-256: 53d14302de81668790a10185e846b3b0fd38cd4dfc421ffe627540ce55581e8b
166 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV detection for 'Win.Trojan.Agent-36100', and a high ML score indicating maliciousness. Embedded JavaScript streams were also detected. The presence of JavaScript actions and embedded JS streams suggests the script is designed to download and execute a secondary payload, which is a common technique for malware delivery. The document body content is heavily obfuscated and does not provide clear user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
03222df29ad3b7e468bd1958e566e3eacff5bab16e805d4c1f5b713fad3fbc38		 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
a17c5e811a0fd40fca5b75c97c6170393daa482e83cb9b0f82304f33d61011cf		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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