Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabfb90ccedb535c…

MALICIOUS

PDF

19.0 KB
MD5: 9d0452d6af88980065c6c79049138a77 SHA-1: 71d1e45cb6ef5659ba881675e7c9c4c6706b5d0b SHA-256: cabfb90ccedb535ce422d69b8004e93c56dfe4107c53966f155c8227a41e536b
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, indicating it is likely an exploit dropper. The presence of an embedded script payload and an embedded file further supports this. While no specific family is identified, the PDF structure and embedded content suggest a common exploit delivery mechanism.

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 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.
  • 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
  • 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
80fd5b4877618740166beec58beb29fd661089a2a68c00d3a61aba8882ee8f94		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18740 bytes

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