Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc5bc8ec8608542…

MALICIOUS

PDF

42.5 KB
MD5: 0e24c7efa59ecec4cca76be722d88a84 SHA-1: 2b60f16127480ca94bee32af018889989ecd5967 SHA-256: 3fc5bc8ec860854201cc7bc4d90c3f4dc73b858a87b692ad9e00289042015326
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating it is malicious. The presence of embedded scripts and an embedded file suggests it is designed to download and execute a second-stage payload. The embedded URLs, while not directly malicious, are related to XFA forms which are often exploited in PDF-based attacks.

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
506ea7ef2dd7ed7400db7be080271325a915fa3dcc69077bade3e6c3f82f4c64		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42772 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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