Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c544c3463d605f…

MALICIOUS

PDF

42.4 KB
MD5: 34a7483acd254897d62d2d1d29ff5eb1 SHA-1: c21b981f94bf4481c3751efabeffa076cb9ef790 SHA-256: 76c544c3463d605f3eb3fcf5be08375bcfacac5cbb450d0f586faecb4b610b13
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, including ClamAV detection (Pdf.Exploit.Agent-36830) and a high ML classifier score. It contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities for client execution. The presence of XFA forms and embedded files suggests a common delivery mechanism for exploits.

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
6ce5e7db8fed5926cadd815228027c4ee6408e82a63f4b12fe5fdf758e5da8cf		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42650 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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