Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4160f9b639d6c5…

MALICIOUS

PDF

150.1 KB Created: 2006-07-21 13:34:36 UTC Authoring application: Acrobat Distiller 5.0 (Windows)
MD5: 521e8e824cef60fd1eb64ce727d4d512 SHA-1: af6c07dd8f1fa118fd663d1e0af75293aab3c277 SHA-256: 5a4160f9b639d6c5e18b5efac57812f80fb2d7df0e83b05c69308d0ae195f89b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a PDF with a ClamAV heuristic firing for obfuscated objects, indicating malicious intent. The presence of embedded URLs, though benign in this case, suggests the document's potential to interact with external resources. The PDF structure and obfuscation point towards exploitation for client execution, likely involving embedded scripts to download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0004

Heuristics 4

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/

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