Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed99bf445fd80911…

MALICIOUS

PDF

19.5 KB
MD5: a139857217e2cde40d22dba7e7ae9f4d SHA-1: 20c7d3b87be568cd7ecb31857afb357738b75484 SHA-256: ed99bf445fd80911b14f764c6a46f4bb8d061f68d724776dfc089e06fa0496cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious exploit. The presence of an embedded script payload and an embedded file further supports this assessment. The file is identified as Pdf.Exploit.Dropped-78 by ClamAV, suggesting it's designed to drop and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
b991750a1b927e8855d0b0b18219a6f465d59b875d79b5ab21e58131985579a4
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19165 bytes