Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6dd0427474f2d5…

MALICIOUS

PDF

42.4 KB
MD5: 0a5308b541913cf9bc87d39027c286d6 SHA-1: 0a3fb8bf8019f1629986165d561a1d45caa4358c SHA-256: 6a6dd0427474f2d507d9687b6980311b4b84e3113c9730ca910caaaa27b663be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and the presence of an embedded artifact. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically targeting PDF exploits. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial compromise.

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 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 script payload in PDF stream low 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 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
f6e947cd1801f6e3ec224cc71588da85bc7dc49d2fe4d7054d6a42749379a04b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42688 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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