Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4b57a276697818…

MALICIOUS

PDF

76.8 KB Created: 2009-11-13 19:41:54 Authoring application: PDF Library 3.4.4 (via PDF Library 1.2.7)
MD5: 38e606532fe208ccf4815af3b91cc03a SHA-1: d355116691be3f87bb2d5caae4f7ff0d5e1e91a5 SHA-256: 6d4b57a2766978183502a9e544b51c91db5256ad84e69f2576297a57f6b11ea7
128 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Exploit.Agent-36110. The embedded JavaScript is heavily obfuscated but appears to be responsible for exploiting a vulnerability and downloading a second-stage payload. The primary attack vector is likely exploitation for client execution via a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36110 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
17bcedae3dbb1d28392b75d325d3175b3062731a348888adad0908492e39d93e		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 38791 bytes

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