Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c5dd7131206506…

MALICIOUS

PDF

42.7 KB
MD5: e634729f8077f7724df00dd68a076913 SHA-1: cf4ed0e9e255e83489b19c00c38e8ad97b2a1714 SHA-256: b3c5dd7131206506561f34828d35117c14f00759278e0ff6bc12622f50a9b7ef
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF file contains embedded content and a script payload, as indicated by multiple heuristic firings including 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'ML_NYX_PDF_MALICIOUS'. ClamAV detection confirms this as a malicious PDF exploit. The embedded script is likely responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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/ In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
a373f3f99263dcaac6db0284d4cfe32e93e95f5c9865b94d3088864d5abdcd48		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42977 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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