Malicious PDF — malware analysis report

Static analysis result for SHA-256 107f6b1d0d073684…

MALICIOUS

PDF

42.7 KB
MD5: ec1358d47e12fdf805e74d949ef37fc0 SHA-1: 4d2a8628f434cf0e7c5145012e2e31faa09134d9 SHA-256: 107f6b1d0d073684bd84f7ac713b7ac7f395a1334e78f4a912b5d91b553d771e
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-36830, indicating it contains an exploit. The presence of PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics further suggests it leverages XFA forms and embedded scripts for exploitation. The ML classifier also strongly indicates maliciousness. The primary IOC is the ClamAV detection name, which often correlates with specific exploit behavior.

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
ad02c2b55288cab7ca261b78a754bb11479b380436690fbb993b229eff8bac30		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42946 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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