Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b9f01bd70104ae…

MALICIOUS

PDF

42.3 KB
MD5: d52f888f913870e724a185d10404bfdb SHA-1: 36d7c9100ea202542fd9df6cf59fe1fe357bd727 SHA-256: a1b9f01bd70104ae2e4ea2cd8ec68ae396b33dff5e24d23578feafd841ae6c66
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious PDF

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830), indicating it contains malicious content. The presence of an embedded script payload and an embedded file further supports this. The embedded URLs, while not directly malicious, are associated with XFA forms, a known vector for PDF exploits. The exact nature of the exploit and payload delivery is not fully discernible from the provided DOC BODY, but the overall pattern points to a malicious PDF designed to exploit vulnerabilities.

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
b6a81175c56b6154e67911528a18d6d902af0ae4b4dec1dd6543c2b5bfe876eb		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42577 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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