Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85da52b97ce27f5…

MALICIOUS

PDF

11.9 KB
MD5: 8d3fa04a31d23b719a8104bbd6c8d7dd SHA-1: 436ce7398793c0e1e890031afab89bd211155fbd SHA-256: f85da52b97ce27f57162ff236c601e216be547777c5787631a3b19235dad629c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78, indicating it is a known PDF exploit. The presence of an embedded script payload and an embedded file further supports this. The XFA form suggests a potential vector for exploit delivery. The exact nature of the embedded payload is not detailed, but the exploit signature implies it's designed to drop further malicious content.

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
60ae7fee72cd3f611da8b604efbb2c6bfa58c8ab4f19e69288440f108586c29c
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11441 bytes