Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18943cb57d1043c…

MALICIOUS

PDF

42.4 KB
MD5: 282d96df6a95c07e200d2579ff3633c7 SHA-1: b798601aa7635fbd0e686df1a0c839cffb750c49 SHA-256: e18943cb57d1043c9731935e38e8421fdc574421810ab168d2c7a86a7b0f5e70
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious PDF

The PDF exhibits multiple high-severity heuristic firings, including embedded script payloads and ML classification indicating maliciousness. ClamAV also detected the file as 'Pdf.Exploit.Agent-36830', and an extracted artifact was also flagged by ClamAV. The presence of XFA forms and embedded files suggests an attempt to exploit PDF reader vulnerabilities. The embedded URLs, while not directly malicious, are part of the document's structure.

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
554db88af29af6cb6444644ba8bb0a8ccd30cac6621538517b913c0ad20201f4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42697 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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