Malicious PDF — malware analysis report

Static analysis result for SHA-256 c498b8eb5e0f5949…

MALICIOUS

PDF

12.4 KB
MD5: bc45a29891038dfaa6560fe4842e8ce7 SHA-1: 2f099a332ffa80f1cbd3cd4dea3f9f9607a44015 SHA-256: c498b8eb5e0f5949e75e8d51426222200ca1ba719018e560a13b9e747625c28c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded script payload and an embedded file, indicating it's designed to exploit vulnerabilities and deliver a secondary payload. The presence of XFA form elements and embedded files suggests a common delivery mechanism for PDF-based exploits.

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
0d10afd452c54f5192c0fe308193ea827f5f7e86837eb10d2f1b49c230a46b8d
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11958 bytes