Malicious PDF — malware analysis report

Static analysis result for SHA-256 23da4b7dd0049ec2…

MALICIOUS

PDF

12.7 KB
MD5: 8396f45592521186b71cc1baa855f54f SHA-1: 7b5160a5cc39b78aad120e9034c5a6a2c51ee6ff SHA-256: 23da4b7dd0049ec28f28e5271f284db4b49e2bf3d8fefe7d4a3e13341312bb56
196 Risk Score

Malware Insights

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

The PDF file contains XFA form elements which are known to be vulnerable to heap spray attacks. The heuristic firings indicate the presence of exploit code and risky executable script within the XFA form. ClamAV also detected this as Pdf.Exploit.Agent-6136306-0, confirming its malicious nature. The primary attack vector appears to be leveraging XFA's JavaScript capabilities to execute arbitrary code.

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
6ffc516a8da59711ead59cc8d82b7071cf0dd9222ba0020eccd22a9256e2fc6c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12283 bytes

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