Malicious PDF — malware analysis report

Static analysis result for SHA-256 a826bd3b9c6c9094…

MALICIOUS

PDF

11.7 KB
MD5: 54210403c725e3c231ceb70b0bad94cf SHA-1: 5532ff59d1f572ee83759e8b94fb71f7d350ced5 SHA-256: a826bd3b9c6c909416dca3926b41f4dfd38d6a5e32c2c40f40a1fdcad693fe35
96 Risk Score

Malware Insights

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

The critical ClamAV heuristic 'Pdf.Exploit.Dropped-78' strongly indicates this PDF is malicious and exploits a known vulnerability. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic further confirms the presence of executable content within the PDF stream, likely responsible for delivering the exploit. While no specific script content was readable, the embedded file artifact suggests a secondary payload is present.

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
86ae92326df27107a195ea453f79c03cfd5317ee9d6ad45c47c223a29c796c01
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11220 bytes