Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d078b37b15510c8…

MALICIOUS

PDF

12.0 KB
MD5: 74eecb61ddcc7813edeb71e2d27fe3f3 SHA-1: c97004223ec5a84be908b50d4524531aa3ad7423 SHA-256: 4d078b37b15510c8471fdf55fa34ada9e9ed1b68ce7d51b112b59893bde6e2f4
96 Risk Score

Malware Insights

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

The PDF file contains embedded content and a 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 for exploitation.

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
4d758aa16b2799d6113225e3ec2a89cf516c360328ff657b746dd6023e93bf94
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11535 bytes