Malicious PDF — malware analysis report

Static analysis result for SHA-256 850434f5196c2ebe…

MALICIOUS

PDF

42.9 KB
MD5: 594287bdb3517627de10cb764cf611f7 SHA-1: 99cbbf3c7ac4b199f4b19eef16fbd7c63eeddb76 SHA-256: 850434f5196c2ebe9e444c455f95280da5d7f4adb7e505e886cebb852c68b06a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The critical ClamAV heuristic firings, specifically 'Pdf.Exploit.Agent-36830', indicate the presence of a known PDF exploit. The PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic further suggests that a script is embedded within the PDF stream, likely serving as the initial stage for delivering the malicious payload. The embedded URLs are related to XFA forms and Adobe, which are common in PDF exploits.

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 script payload in PDF stream medium 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 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 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
d357d4a60f511465faeef7a83973e74dc94804a77278be42ce9afff1af1919ee		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43134 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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