Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3c051555167438…

MALICIOUS

PDF

25.4 KB Created: 2007-10-09 14:26:29 -03:00 Authoring application: Acrobat PDFMaker 8.1 for Word (via Acrobat Distiller 8.1.0 (Windows))
MD5: 35da1068c859a94ae6d2eeb2e037ff1a SHA-1: 16e39e5e9f486de796a1c339c8687ef7f65cf11d SHA-256: ee3c05155516743893e345529a07a89600d83f390d7c6fb9851ba5356a242e81
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell

The PDF sample contains a malicious URI that attempts to execute a command interpreter. Specifically, it leverages a PDF vulnerability to run 'cmd /C echo r edx=0x1000000 >> C:\windows\system32\ZZFJ.bat'. This indicates an attempt to write a batch file to the system directory, likely as a precursor to further malicious activity. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5945

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-35915 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35915
  • PDF URI references command interpreter path high PDF_DANGEROUS_URI_COMMAND
    PDF contains a /URI action whose target uses a mailto/path traversal shape and references a command interpreter or scripting host. This is not a normal web link and matches legacy PDF command execution/dropper lures.
  • External URI low PDF_URI
    PDF contains an external URL action
  • 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.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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