Malicious PDF — malware analysis report

Static analysis result for SHA-256 8522433b9119b622…

MALICIOUS

PDF

42.7 KB
MD5: bec0b74952bdbd38393f8dec1a772307 SHA-1: 453d908d5c94eb545aa3053d9d5bee904bdcd470 SHA-256: 8522433b9119b6228c87b75d894c4050be0d380992cacb26eab224b890180cab
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple high-severity heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36830', indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. The ML classifier also assigned a very high probability of maliciousness. The embedded URLs are benign and related to XFA forms, suggesting the exploit targets XFA functionality.

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
f122868637fd7a915f125c5e003e2502e0fbdb4e6f9f7b6605e4468539551cc3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43017 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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