Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b823ce7b48cf119…

MALICIOUS

PDF

42.3 KB
MD5: 890dc01f56702b5d327e7185799ea219 SHA-1: c2a12da457581fd2efe281c4107a87353df76127 SHA-256: 0b823ce7b48cf119d27c20359f7f9ff8f35203ae433513bc0b5eed881e7f01b2
176 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier, indicating it contains an exploit. The presence of PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA heuristics suggests the exploit is likely delivered via embedded script within an XFA form. The exploit targets PDF viewers for client execution, and such files are typically delivered via spearphishing attachments.

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
5a61cdbd6c7934ff6758a319bf0a22f16b38f82ea22d5a58db21081ec7a429b8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42605 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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