Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d65dcb3ca264d4…

MALICIOUS

PDF

18.8 KB
MD5: b81ffd91bdfd81daa63ad98b69bb2a32 SHA-1: ba955465b64f96b79b672e8aee469ecbf6ee75b2 SHA-256: b8d65dcb3ca264d42bee7d0b81b5326d02a67290675b65bae80d397d6c8e41cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple heuristics, including embedded script payloads and a high ML classifier score, indicating malicious intent. ClamAV detection as 'Pdf.Exploit.Dropped-78' further confirms its malicious nature. The presence of XFA forms and embedded files suggests a common delivery mechanism for exploits. No scripts were directly extracted or readable from the document body, limiting the ability to detail the specific payload delivery mechanism.

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
880f57d4a738626fa4f01e6908c18157c4211650df4416ef142a3d2b8fce9da5
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18513 bytes