Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9c3831bb3d71ec…

MALICIOUS

PDF

19.1 KB
MD5: dcf369ae5e3516f57501dd47240520e3 SHA-1: cc92eb1cd924409e267189ebaea48db618dc5699 SHA-256: 8d9c3831bb3d71eceff4788e8095c00469013d24b618c3ec44847019a56c4864
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78' and a high ML score indicating maliciousness. The presence of an embedded script payload and an embedded file further supports this assessment. The document body content is obfuscated and does not provide clear user-facing lures, but the technical indicators strongly suggest exploit delivery.

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
250a0786bc50419b4d0fc611483f3bf8a8da763848c10f0a69778b6ea4ffce9f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18840 bytes

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