Malicious PDF — malware analysis report

Static analysis result for SHA-256 e835f368f016a7e1…

MALICIOUS

PDF

27.7 KB
MD5: ee817655a6117c157de189539f99de45 SHA-1: 1e339233a80eed086ffc6b4deece00e8f892c9f4 SHA-256: e835f368f016a7e1b533cbf0c7c5137e47e292c63009384494be0c888c8afd2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as Win.Trojan.Agent-36100. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, suggests the file is designed to execute malicious code. The ML classifier also strongly indicated maliciousness. The obfuscated document body does not provide clear user-facing content, reinforcing the likelihood of a malicious payload being delivered via the embedded scripts.

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
e22f5415a222b74cf29aa6753ad8fae49a056ecfc82910e28bce909a461bb2f3		 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
8430724dda451e3dbe910e0e82a72fa3bbc3f4d7808e515daf5bcdb6fe66797a		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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