Malicious PDF — malware analysis report

Static analysis result for SHA-256 b723cfb508e19cde…

MALICIOUS

PDF

12.0 KB
MD5: 700f3d174a7ab5f6c5f88e4658c42ba0 SHA-1: 08f6379c7aa134d5237db63792bd315ec0823bcf SHA-256: b723cfb508e19cdeda264d40ed6ca5e4e7a8bb3ae9dbae19e35a94b5d37033c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.007 JavaScript/VBScript

The PDF file contains critical XFA heap spray exploit code and embedded script payloads, indicating it is designed to execute malicious code upon opening. ClamAV detection further confirms its malicious nature. The primary attack vector appears to be leveraging a vulnerability within the XFA form processing to achieve arbitrary code execution.

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.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
8379f6a912e834136af789b635aecb8b897a7dd7279e79a03c0004f0da602e47		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11561 bytes

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