Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a387f0a235e7d…

MALICIOUS

PDF

12.2 KB
MD5: 1dfb8756de4c9497ec45fec979b62c1f SHA-1: 439b4fdebf0eeb56477fc9e80c9032cc2f4c8a02 SHA-256: 914a387f0a235e7ddecd1a0abb7afcdc2be111fca032c848e7065cd87ace9468
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely an exploit. The PDF contains an embedded script payload and an embedded file, suggesting it's designed to drop and execute a secondary malicious component. The presence of XFA form elements and embedded URLs, though mostly benign or unknown, are common in PDF-based attack vectors.

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
d050c7534c3524e8ff80b2de3e18e5b8aed3544725a8ff82f78dbdff82f8c629
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11758 bytes