Malicious PDF — malware analysis report

Static analysis result for SHA-256 708fe7bd06197588…

MALICIOUS

PDF

42.7 KB
MD5: 44c5efc9a52d0505bcfcff092caae5ec SHA-1: 167eb81b5af3a6ee43c46a664d3dadf94b09379a SHA-256: 708fe7bd0619758870a0842f42fdf82ee7d64925f0783c896f8abc2d60486824
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 score. The presence of PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD suggests it leverages XFA forms and embedded scripts for exploitation. While the document body is heavily obfuscated and difficult to interpret directly, the overall evidence points to an exploit attempting to execute arbitrary code, likely delivered as a spearphishing attachment.

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
1bfb7e02ac01d755b0656f8879194851f9254c86cbe7a9baf062946b8d125a85		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42988 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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