Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3c23e3385c4ddc…

MALICIOUS

PDF

19.2 KB
MD5: ac8d159c596bee8b89378719bd26e58f SHA-1: 6efd2363bf7b0756240a2193f7d581c8c07dfbef SHA-256: 6b3c23e3385c4ddc2c4f2305099045787265a4296da8365653341900287b1cf5
116 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains an embedded script and an embedded file, indicating it is designed to exploit vulnerabilities and deliver a secondary payload. The presence of XFA forms and embedded scripts suggests a common technique for exploiting PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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
031046f7fd0b1406d94e375ffd4f1a5cfa6e872dc00399d01cb709f8627473bd		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18911 bytes

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