Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e9622ba712f885…

MALICIOUS

PDF

11.9 KB
MD5: fdd3fb079153d6ad4ce3f5c58ef81663 SHA-1: 79fec41ab15b9f8c81dadb486ed298c68b6510ca SHA-256: b7e9622ba712f885115f642b45aa2cb3a5d981984417b7cf97e1687f9e049ecb
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier with high confidence and also detected by ClamAV as Pdf.Exploit.Dropped-78. Heuristics indicate an embedded script payload within a PDF stream, suggesting the file is designed to exploit vulnerabilities upon opening. The embedded file artifact further supports the payload delivery mechanism.

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 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
822dee88d2ad4607ce25c52bf286ce57cf062d018c69d836e294860e6dd556c3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11449 bytes

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