Malicious PDF — malware analysis report

Static analysis result for SHA-256 204b1877cb052802…

MALICIOUS

PDF

6.5 KB
MD5: a91f57054bf4acf8989fd9c834e1479b SHA-1: 6298615686fbe0ca4af0902fafed4541119f3e06 SHA-256: 204b1877cb052802cbf9961a28cb75245387988d65725c5c906c37e44bfdc7f9
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as a dropper. The unescape() call within the JavaScript points to obfuscation, likely to hide the execution of a secondary payload. The extracted ClamAV signature 'Pdf.Dropper.Agent-7237717-0' is included as a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7237717-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7237717-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0009_000.js
99730447711130ebf1c4a807f743e994c038bf6fe8b9c3d89ce44df8ad8622e7		 pdf-javascript-stream PDF /JS object 9 at offset 0xD6 5347 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 eval/decoder/string-building token(s).

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