Malicious PDF — malware analysis report

Static analysis result for SHA-256 b913fccab80a19a3…

MALICIOUS

PDF

12.0 KB
MD5: 0b8e9f60985462a2a3a470e7231f54f1 SHA-1: 5d4cca3263f7f2649091743241e742f3df6598a5 SHA-256: b913fccab80a19a3a2a20ef4314aac3c7dda0718644946978784c75fff3a221f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV with the signature Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it is designed to exploit PDF vulnerabilities and deliver a secondary payload. The presence of XFA form elements further supports the exploit vector.

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
fcada077ea2e695503a918fb3ca1aa1e266c066040eec0004a3270913eca0adf
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11503 bytes