Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5282b68eb7d231e…

MALICIOUS

PDF

35.6 KB
MD5: 2bc3618ca02ec526015566f1b9dace85 SHA-1: 1b55a8e625d6ed98ff59ef567fa044017694ab48 SHA-256: f5282b68eb7d231eb7e31d92df0d5c6fd387b9a81d4134e4bd8342c51cec72dd
68 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by an ML classifier with high confidence. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it's designed to deliver a secondary exploit or malware. 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
2d4d085dd76e587212ffcf52574c5774537c38a3d1d55f705614c5a769f62427		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 35759 bytes

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