Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78a5a232050edc7…

MALICIOUS

PDF

11.7 KB
MD5: f32ea65ba1f208fcc9319e7a96b0168c SHA-1: bc1aaa8b781864891451051c66cce00b67afad31 SHA-256: c78a5a232050edc7ba5714f18ab20fee92d71a9d4bcf2f1e0b90e34ed2ac1677
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1566.002 Phishing: Spearphishing Attachment

The file was detected as malicious by ClamAV (Pdf.Exploit.Dropped-78) and a machine learning classifier with a high confidence score. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it is designed to exploit vulnerabilities. The embedded URLs, while not directly malicious, are associated with PDF structures that can be abused for exploitation.

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
445cd13fcbaa5b18e3e016536d58e3bd8f876be54c8bea08eab44ff1a50bc4e8
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11210 bytes