Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66a95f686d3a35f…

MALICIOUS

PDF

12.2 KB
MD5: 682edabc1f7609e486022429f39c69c5 SHA-1: f66d65ef82d822d71487f497761570d1d39af3d3 SHA-256: a66a95f686d3a35f23fd778104c3bedb19e737d6fdc055bf030ade6c6e471cef
96 Risk Score

Malware Insights

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

The PDF contains embedded content and an embedded script payload, as indicated by the PDF_EMBEDDED and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. ClamAV detection as Pdf.Exploit.Dropped-78 further confirms its malicious nature. The embedded script likely attempts to download and execute a second-stage payload, although the script content is too obfuscated to determine the exact mechanism. The presence of XFA form elements also suggests a potential exploit vector.

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
d430824d03567f84c6cbfd82519fcb57f4eda61f167fe3b2cac8d8265bbcd333
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11722 bytes