Malicious PDF — malware analysis report

Static analysis result for SHA-256 6920a75d75a9add8…

MALICIOUS

PDF

19.2 KB
MD5: 210cdcc6d4b2b6b8b3ef826a3188ae48 SHA-1: 2ea78ca4dc5efb22061834093cab5fc5ffc89dec SHA-256: 6920a75d75a9add8df05b50a0a6f2ed40bb878a097ab270b2a46d4de7e41c41c
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating an embedded script payload and an embedded file. The XFA form suggests a potential exploit vector. The primary function appears to be downloading and executing a secondary payload, as indicated by the embedded script and file.

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
2ae703e8f17568226a5ad321d05ff3fc0c2f8144f01118c523185ed731ee434e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18905 bytes

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