Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3bff70cad8df7a…

MALICIOUS

PDF

13.3 KB
MD5: 0abfac4b3a2a3dc67241b548dffc46f0 SHA-1: 355f13ef6436502402375a3124946cfc478ab205 SHA-256: 4b3bff70cad8df7a844f14ab86848ebfc85a515089cd6dd432ef301e863abdce
66 Risk Score

Malware Insights

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

The PDF was flagged as malicious 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 payload. The embedded URLs are likely part of the exploit or delivery mechanism.

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
9c25c7265c0b94c0d7833b58100009e61fa48f63d260e7b25c02e68676c59684		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 12896 bytes

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