Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c51cba0c9f60e2…

MALICIOUS

PDF

63.1 KB Created: 2009-11-11 19:48:37 Authoring application: PDF Library 3.7.6 (via PDF Library 4.7.6)
MD5: b71f776913e0c3641225b29fb65fdddf SHA-1: 184619e49edb4467d736093d943030c05985b6a3 SHA-256: 40c51cba0c9f60e2b043579f83679df1b1c723477499e61aea8810b0d7b60cdf
128 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and a high-confidence ML classifier. The presence of embedded JavaScript and the use of ASCIIHexDecode filters with exploit indicators suggest it is designed to execute malicious code. The ClamAV signature 'Pdf.Dropper.Agent-7253903-0' indicates a dropper functionality, likely intended to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7253903-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7253903-0
  • 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
ad991412c0c56c2ade846493b9335a90e28d76347bfaf0c6926385799f897dda		 pdf-javascript-stream PDF /JS object 7 at offset 0x18C 31835 bytes

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