Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c882fbe83735f55…

MALICIOUS

PDF

19.1 KB
MD5: c312a61a20f3cc6dd1bed973901404d7 SHA-1: 6724abb76ad2620a6eed7433125ea92b9528cf40 SHA-256: 5c882fbe83735f551ae875faf6bbc18b0a96f4428f03cdd17bdc01b27d0c728d
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 ClamAV and an ML classifier, indicating it likely exploits a client-side vulnerability for execution. The presence of an embedded file and script payload further supports this. While specific delivery is unknown, it is likely delivered as an attachment.

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
44556623c32652cf8de96cb7fbea15feddd5fea26e91f3885ae54cd451ee9ea3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18807 bytes

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