Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a2677cc3ad4cff…

MALICIOUS

PDF

11.8 KB
MD5: fb8f1723fbb315aa5c3fa1ef73b956cd SHA-1: ef99b891d15f5487c002cdc12d67454369d2af7a SHA-256: 66a2677cc3ad4cffd9d7a7322211b3348060ef5fac769137f06c21939df3a843
116 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78', and an ML classifier with a high confidence score. The presence of an embedded script payload and an embedded file suggests the PDF is designed to exploit a vulnerability and download a secondary payload, likely delivered via spearphishing.

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
0ca5fd642e9bdf26f80b8cc590f5b56554774bbf6dea0224e8e50afa41ea0477		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11325 bytes

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