Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a81988b1501629a…

MALICIOUS

PDF

19.4 KB
MD5: c927ea1114576b939c1f966648b02540 SHA-1: a2c479f3b9a131721f79c885cfdec6aa548d30ee SHA-256: 0a81988b1501629aaf3df0659c5ab889246c5e5b15d44beffa9d1813721c8b5c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Exploit.Dropped-78, and an ML classifier indicating high maliciousness. It contains an embedded script payload and an embedded file, suggesting it is designed to exploit a vulnerability and download a secondary payload. The benign URLs present do not appear to be related to the malicious functionality.

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 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 script payload in PDF stream low 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 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
ff54cb993609bd11173bd8f8f828d8c0c63369894d0ca06f1688665249a2cc51
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19056 bytes