Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93b531a0a30ee2a…

MALICIOUS

PDF

25.9 KB
MD5: 9f640cf92e603ee14cd387f8eb9aa55e SHA-1: fb83ae8794a1b0ab7bc82b7462ffeebcac8d415c SHA-256: c93b531a0a30ee2a8de003ee7974d9efb7aacd7efd36d85e9a6d03aa249a3f02
126 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78. Static analysis identified an embedded script payload and an embedded file, indicating the document is designed to exploit vulnerabilities and deliver a secondary payload. The ML classifier also strongly indicated maliciousness.

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
310d60b906afacd259a6c5ff8e480d3f9dff527b968d05d4cbe190d178a37eca
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 25810 bytes