Malicious PDF — malware analysis report

Static analysis result for SHA-256 7052c3b3510bec9d…

MALICIOUS

PDF

43.1 KB
MD5: 9af0e9c5d6a02db54750ed4383cbb85c SHA-1: 2ef7e8e69204a8e0316cd1c65c1248c0ab5146db SHA-256: 7052c3b3510bec9d360bf59cf70c2372ce5c6d2dca74ef52dcbe47f763432ab0
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a ClamAV signature (Pdf.Exploit.Agent-36830). It contains embedded content and XFA forms, which are common vectors for PDF exploits. The ML classifier also strongly indicates maliciousness. The primary attack pattern involves exploiting vulnerabilities within the PDF reader to execute arbitrary code, likely delivered via spearphishing.

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
655c8a25141d225e3729f9ea4ff80e86e971b7a1ecfc658ae164ac5cd263ef4b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43356 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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