Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29ab79b2b9b8e7b…

MALICIOUS

PDF

19.0 KB
MD5: 023a6c13a1ad0550969a2cc5f0d625b5 SHA-1: a4bdb46eef4b525bfa39d6b7b0579431dbf46960 SHA-256: c29ab79b2b9b8e7b9a84b2c9d8fa45b8a364a043e3baea10b7a239e3ee5317e2
128 Risk Score

Malware Insights

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

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious document. The presence of embedded script payloads and embedded files strongly suggests it is designed to exploit vulnerabilities and download/execute a second-stage payload. The embedded URLs, while not directly malicious, are related to XFA forms which are often targeted in PDF exploits.

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
4091cccbc1b88f5174e572409e529356d0ff8513a1171c0c03c31c4c7a3050e2		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18698 bytes

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