Malicious PDF — malware analysis report

Static analysis result for SHA-256 781d6c2cf95c2b4a…

MALICIOUS

PDF

42.2 KB
MD5: 3c77ebebfc3e6f7f5fe422b2ad3fa790 SHA-1: 1cd079b61cee9957abfcd502f67f74c75033a06e SHA-256: 781d6c2cf95c2b4a7357ea5547745c4c197feb1462f6afb34943c5bf4c62b93f
176 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically as Pdf.Exploit.Agent-36830. It contains embedded content and XFA forms, which are often used to deliver exploits. The primary detection signature is Pdf.Exploit.Agent-36830, indicating a known exploit.

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
9b94fb7ffdabea77beb221f7bd1f7893e2ef7c23d4f014e9a413102a72eb512a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42445 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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