Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9c9d2a77d4c681…

MALICIOUS

PDF

1.5 KB
MD5: ff0f0523ffe5e36246bb8eb46172b3a7 SHA-1: e6effa897976fe0d3af469e525850517a2fb7605 SHA-256: 2b9c9d2a77d4c681a8bcad16c5df0e325e69499245e9c71e586ff850a5c6fcd7
118 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests that the JavaScript is obfuscated. The ClamAV detection of 'Pdf.Dropper.Agent-7243486-0' and the presence of suspicious extracted JavaScript files ('javascript_obj111111_000.js', 'javascript_obj111112_001.js') strongly suggest that this PDF is designed to act as a dropper for further malicious content. The JavaScript likely downloads and executes a second-stage payload.

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7243486-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7243486-0
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js
08fb6207364c7da7da9ec39b8d808e1d5f670c5535c2f4875013b8bfe0bbcf64		 pdf-javascript-stream PDF /JS object 111111 at offset 0x160 2214 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj111112_001.js
5cd9c34688c78756871ec4b627025fe07bb42ee6ef9493fe0dea7b5b4f9208bb		 pdf-javascript-stream PDF /JS object 111112 at offset 0x549 65 bytes

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