Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca66bfbbb6e2a1d2…

MALICIOUS

PDF

42.5 KB
MD5: 0f70eae977b8735916e6cd8432e1930b SHA-1: ab0e4e00ef35c51bec56f96a869ebb6856c4d437 SHA-256: ca66bfbbb6e2a1d26c5915f9fe221d62cbeaa9e6d7e9170c88eafb4173516aed
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, indicating it contains malicious content. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic suggests an embedded script is present, likely responsible for the exploit. The embedded artifact 'embedded_file_obj0008.bin' and the ClamAV signature 'Pdf.Exploit.Agent-36830' are key indicators of the malicious nature of this file.

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
2a7eb86397c9c950e15fc7ea5008d6765c64c42a38b4474892fae1dfc519a878		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42742 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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