Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ec5f10ab93eae7…

MALICIOUS

PDF

42.9 KB
MD5: f1bc2ca27d8bcb191d4a4d7158f4fca6 SHA-1: 37c8a5c7c3404bcb44c78f3f85184503107b0b51 SHA-256: 44ec5f10ab93eae73780c61f0e901d2ed7899bb195d4307db29e49987f7ee300
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious PDF exploit. The presence of an embedded script payload and an embedded file further supports this. The embedded URLs are likely part of the exploit or lure, though they are not directly malicious themselves. The ML classifier output of 0.999995 strongly suggests a malicious exploit.

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
06cc86a03b3dc5ab161d1741dc132fdecfae54ed76dde9498e771bf3f99ea441		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43181 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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