Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc1c57d0f317df5…

MALICIOUS

PDF

42.9 KB
MD5: c94fa198e87ea570160a2bdae7b8e985 SHA-1: 49cbbbcd110460979b24800b30d1e7019bfbf739 SHA-256: cfc1c57d0f317df5f9608b45de17a6be0025c59f18ebb45a73f7992ab307780e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.001 PowerShell

The PDF file contains an embedded script payload and was flagged by multiple high-confidence heuristics, including ClamAV detection for 'Pdf.Exploit.Agent-36830'. The ML classifier also strongly indicated maliciousness. The embedded script likely attempts to exploit a PDF vulnerability to download and execute a second-stage payload. The presence of XFA forms and embedded files further supports this attack vector.

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 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
bd44864f5097e8e43ce56f7077de0fff0313921224a6f10837fbefb87122e9cc		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43219 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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