Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8bfa7ca6774c3a…

MALICIOUS

PDF

12.2 KB
MD5: 03ffc4bb074cce5204c915a67046dbb3 SHA-1: 79a2aeaa974b0a6f0274fe438c45b5d3514e1549 SHA-256: ad8bfa7ca6774c3a06b3878efd66d07ff029ac7075e74844a43f9fa9b324a8cc
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and an embedded file strongly suggests it's designed to exploit vulnerabilities and drop further malicious content. The document body contains obfuscated JavaScript, indicating an attempt to hide malicious code execution.

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
737d9e0e42f14208aa1d0396e03a69abbae227804d04c9c69b0e7801547f1bdd
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11708 bytes