Malicious PDF — malware analysis report

Static analysis result for SHA-256 604aef643681d387…

MALICIOUS

PDF

26.8 KB
MD5: f911407d0c9904760a5cb5c3238993a1 SHA-1: 95a16ebd11c36f2c8250e53cd76570e05dce8c40 SHA-256: 604aef643681d38709c71c2cee08e824eadbe2480ce8f9f83974e749be95e1a3
116 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by multiple engines, including ClamAV with the signature 'Pdf.Exploit.Dropped-78'. It contains an embedded script payload and an embedded file, indicating it's designed to execute malicious code upon opening. The XFA form structure suggests a potential exploit targeting PDF rendering or form processing vulnerabilities.

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 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
d3d16f5c970a16aa59a1753b00fd92c9fb3f4a44d3d942b90f851ae3ce98ccf5
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 26686 bytes