Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bf433f2e3a0b52…

MALICIOUS

PDF

12.8 KB
MD5: f3e63ae04d5ac4a1a56fa1b5cd95aa7e SHA-1: 4067c7393fe3be3461a11d4ca355ad985516f6d2 SHA-256: d0bf433f2e3a0b52dd7246234f5d81228242d7bc0ea221b4fbe139729112e71d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains XFA forms which are known to be vulnerable to heap spray attacks. The heuristic PDF_XFA_HEAP_SPRAY indicates the presence of exploit code designed to leverage this vulnerability. The embedded script payload and the ML classifier further confirm the malicious nature of the file. The primary attack vector appears to be the exploitation of XFA forms to execute arbitrary code, likely leading to the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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
16eb137b08cc2f42930dfbaa0eba4804c4aac76402838e69bf5281917f54e709		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12297 bytes

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