Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bad41738f470ac…

MALICIOUS

PDF

42.5 KB
MD5: 1f1912757ad7b851d51a35347a15b773 SHA-1: a337efe58a1d6948f09277f294d3cfe565d163f4 SHA-256: d2bad41738f470ac91be1a90e86a0d32263ff098729c8816e0c4e6463476b17a
186 Risk Score

Malware Insights

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

The critical ClamAV detection and ML classifier strongly indicate malicious intent. The PDF contains an embedded script payload, which is a common technique for delivering exploits. The embedded artifact, also detected by ClamAV, likely contains the secondary payload. The attack pattern is consistent with exploiting PDF vulnerabilities to execute arbitrary code.

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
21e987696386e07c0dbb747b9bb35008d4531116f0008fc4fbb8831d0cab1f27		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42726 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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