Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7cd5383cc19ba2…

MALICIOUS

PDF

19.3 KB
MD5: bfc2e3958abec0cf43828f1e19e83dc3 SHA-1: 3bf2d5bd218c197521fd9541500e979ba201fa84 SHA-256: ff7cd5383cc19ba26c2cf792e23059b4a660b2955af8cb780b29d011acee14ed
128 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Exploit.Dropped variant. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to drop and execute further malicious content. The XFA form structure further supports its exploit-oriented nature.

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
c72a047790abc7561148b8d746114d858c693f25d0d07aa062f72605537ea2fd		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18996 bytes

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