Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd823dfa48d8ecf…

MALICIOUS

PDF

18.9 KB
MD5: 0af0d35418b6cea1cadb06826e713853 SHA-1: 2ae895b105231d312a887a5d3b4aa03e87ab5843 SHA-256: cbd823dfa48d8ecf74fc27afb3178f3fbb3b77f30930c60eb868dcf44c6dd6c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML score, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports this. The file likely attempts to exploit a PDF vulnerability to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
83b9253c9fce7cd42757fded5fbdd0469ff0a9d32a7803236835a57403481211
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18589 bytes