Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bb56b69b41dcea…

MALICIOUS

PDF

11.9 KB
MD5: 3b4b6e679a97444a6ceef7cd61f9c889 SHA-1: 2b850158a751d24f3aa081f542be8bb7aa0f5caa SHA-256: f8bb56b69b41dceaabae7a220ce632e6bf250086d7c07a2ca62e0d3390696cd1
96 Risk Score

Malware Insights

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

The PDF file contains embedded content and an embedded script payload, as indicated by the 'PDF_EMBEDDED' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics. ClamAV detection 'Pdf.Exploit.Dropped-78' 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 forms also suggests a potential attack 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
5a92f57f444563d288582be57d38c98efb2a9594e4f9202e29e202e9bafd5980
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11381 bytes