Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b053987ff64b56…

MALICIOUS

PDF

42.3 KB
MD5: e7aea52a6a703478e899b15fc81295e1 SHA-1: 528f228942038d8861971f53373df858c144e759 SHA-256: a2b053987ff64b56784b1e66579649cd959064db194ac798723ba1324e8de32f
188 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The PDF contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities and deliver a secondary malicious artifact. The embedded URLs are likely related to the XFA form functionality, which can be a vector for exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
86862d7083d583e830b34e9fb2b6b4d0e91e6d7921e90cea8dac3b36bebf45f4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42613 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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