Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d50fd6980d0747a…

MALICIOUS

PDF

42.5 KB
MD5: 8ed6d66b943eb876393b2a419503f8c7 SHA-1: 346a594b1cf9176042a5e7740bca36fb7f7c477a SHA-256: 5d50fd6980d0747a38950ddd618f9363bc8659af2f398f62d53a7b80ad522a20
176 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating an embedded script payload and exploit. The embedded JavaScript, though obfuscated, is characteristic of PDF exploits designed to download and execute further malware. The benign Adobe and XFA URLs do not detract from the malicious indicators.

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
39b0e719c0610bc815e9a8781d9799d03b2f1d25f500bbb42adb6e916485a554		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42778 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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