Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdaf65b63afa1c3…

MALICIOUS

PDF

46.7 KB
MD5: 9fbd48ed7e1720b7a16226981ce401d4 SHA-1: ea1d539b63bd058bf878e2e139a1bb10c21d69d6 SHA-256: 2cdaf65b63afa1c3b6845088f1bffd693266575e80ce8cd07f3ab9d26cf10be2
186 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file further indicates malicious intent. The ML classifier output of 0.999994 strongly supports the malicious verdict. The primary attack pattern involves exploiting a PDF vulnerability to execute a malicious payload.

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
07b0fd4aae3bce55fc9e99c374fb145a3c00330a367fbe9983bfb5d50b5abc18		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 47070 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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