Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a564a18de0607b…

MALICIOUS

PDF

42.3 KB
MD5: 25a726fc73b20ddf21246e46e2b881a2 SHA-1: 45f8dfe19716febd8d2bf2d474ebda22dbb41c12 SHA-256: 03a564a18de0607b671276d80810d820e118cae887f7fb5eb009e0a9e2b601b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple high-severity heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36830'. The presence of PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD indicates the use of XFA forms and embedded scripts, common vectors for exploiting PDF vulnerabilities. The ML classifier output of 0.999995 further supports the malicious classification. The primary IOC is the ClamAV detection name, which often correlates with specific exploit kits or families.

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 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 script payload in PDF stream low 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 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
24925a6a7849375b66c2c51d02117135c1447eb6c6bdceb7345da8e6f9ca6f33		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42557 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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