Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd494cba9357b88…

MALICIOUS

PDF

11.7 KB
MD5: acb477ac68cc118bd68e81cc5abbb2a7 SHA-1: d96fb41e9d8ac9f3d702650b0297bc60b2a67115 SHA-256: 9cd494cba9357b8851ba1d743cddddc29d6f3dc57b068ac47c856a8c89860aa8
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of an embedded script payload and an embedded file suggests the document is designed to exploit a vulnerability and download a secondary payload. The embedded file 'embedded_file_obj0008.bin' is a key indicator of this dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
213ede41bf9cde1484254e07c66704f1b9cfb6fb556b36323f36ed13468adfd7		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11194 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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