Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8976b1d514431d…

MALICIOUS

PDF

19.2 KB
MD5: eb3f3c7e6e53654689fc44b98aafc6d0 SHA-1: 1393ef5fbfa06cf4a118d73a8d5a32a73f90810d SHA-256: 6d8976b1d514431d488f9bcba734909810759e3c474d7f7dae892e600d512e71
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection. The presence of embedded scripts and an embedded file suggests an attempt to exploit vulnerabilities for client execution, likely delivered via spearphishing. The benign URLs extracted do not appear to be directly related to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. 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/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_file_obj0008.bin
4959b2d6d57019079c0f9568cc3a69ac194fcac47265822847625de58ea39aa7		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18861 bytes

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