Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1444d3619e2a2a…

MALICIOUS

PDF

11.8 KB
MD5: a88c9043ae83e77f13a8a97e1c3be780 SHA-1: 83c398f02d34eb9b3af425ea939361a7bce06e0f SHA-256: ff1444d3619e2a2a79889cfc3c356f45484363c2e5899a5d9b2a90fc645e5065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a Pdf.Exploit.Dropped variant. Heuristics indicate an embedded script payload within a PDF stream, suggesting it's designed to exploit vulnerabilities upon opening. The presence of XFA forms and embedded files further supports its role as a dropper or exploit delivery mechanism.

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
037e6cacf4c973ab61e0821cf8c8fd3ea1df1538359836663dbcd543a279523a
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11294 bytes