Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19194af6dbc9ab6…

MALICIOUS

PDF

19.3 KB
MD5: 1f2d5f34d88127eeb9c9ac2514b2d627 SHA-1: d97c4feaa292f79f39a0e8f0be6a736e37dfe91c SHA-256: b19194af6dbc9ab6a2909d3d22ab42931848899411594a143a45698a7664e096
128 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports this. The embedded URLs are related to XFA forms, which are sometimes used in PDF exploits. The exact nature of the exploit and payload is not detailed in the provided evidence.

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
cf7964e8a8811d72b98e3399369eb9490137bea94cafc0166c73666d03be9ec1		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19008 bytes

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