Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fabde346eb91ee…

MALICIOUS

PDF

97.1 KB
MD5: d9fbad52464584d84dae9b72f165fa49 SHA-1: 93a394a03ee623d4f3cb6fe2ba2c77b10aff1547 SHA-256: a3fabde346eb91eec67fb2f3912dfdfe5bdacc5661caa0a2647c831b51183a92
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF utilizes XFA (XML Forms Architecture) which is a known vector for embedding malicious scripts. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded script payload, though not directly readable in the provided evidence, is the likely mechanism for exploitation, potentially leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000026c.bin
23db53979920e64ffaf8fad02a30376c6cebfed3a16779d398ede71f0de52582		 pdf-embedded-script PDF raw stream script payload at offset 0x26C 98659 bytes

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