Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e83dc31490d142…

MALICIOUS

PDF

13.5 KB
MD5: 1ae9146250b00bbd49ac2399cfa90216 SHA-1: 99a109a40ba4a04a8e7678e971cf2d40234c7927 SHA-256: f6e83dc31490d142776f751240778dc5a570025e22e4fd29aa328d6a8d69cc0e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The ML classifier strongly indicates this PDF is malicious. The presence of an embedded script payload and an embedded file suggests it is designed to deliver a secondary payload. The embedded URLs, while not directly malicious, are associated with XFA forms, a known vector for PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • 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
81b71ae9a43f5324a3eabeb98d0f36427e013d4e55755453644b013addc11dcf		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 13075 bytes

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