Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb3851d678530f2…

MALICIOUS

PDF

381.1 KB
MD5: 7005e9ee9f673edad5130b3341bf5e5f SHA-1: 5fa6fd33279c1f1c8e79aad1e0045b73acf04b08 SHA-256: 8eb3851d678530f204eb173488b2ac59a31f735c715f6147c38eb7ea0fc19688
194 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. A machine learning classifier and ClamAV also identified it as malicious (Pdf.Dropper.Agent-7125223-0). The presence of eval() and unescape() in the JavaScript strongly suggests it is designed to deobfuscate and execute malicious code, likely downloading a second-stage payload. The document body content is not human-readable and appears to be obfuscated code or data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-7125223-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7125223-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js
dbf2b563944354536cd472733310ee3c9e5780686e4e5cd639764efd7ba740c1		 pdf-javascript-stream PDF /JS object 1 at offset 0xA 67070 bytes
stream_000_off00047995.js
dcefc16710d335e69f60cdd8a0e174d43939d02eaa8dd4c6d7ce4ca63f06495b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47995 289498 bytes

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