Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b816e1967fa285c…

MALICIOUS

PDF

11.7 KB
MD5: 13687155fe80f0f9ba07a444a43f907b SHA-1: 5cf6c64a38b1db33e98fe4a5778868c145f47c77 SHA-256: 1b816e1967fa285cff29e5f00d0ffaf673b4de1fef6e6e7d5f41596f21464020
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The file is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains an embedded script payload and is flagged as an exploit. The PDF structure also indicates the presence of XFA forms and an embedded file, common characteristics of malicious PDFs. The embedded URLs, while not directly malicious, are part of the document's structure.

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
f5e1eb9897ef34ffd5a72bb8d1a0dc54f74cc39d17a0024f10e849cba2b8b9bb
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11230 bytes