Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cdc4205f292440…

MALICIOUS

PDF

12.7 KB
MD5: 90c5a00e5fa2c3e27ed2ce6d4bb16d3d SHA-1: 86d2269d0d94487be3e48d045cc009bbc7680cf6 SHA-256: 31cdc4205f292440818783899364085898dbcca7c301f87c86a4bdc970e6d66f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The 'PDF_XFA_HEAP_SPRAY' heuristic firing indicates the presence of exploit code designed to leverage this vulnerability. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' firings confirm that executable script content is embedded within the XFA form, likely to download and execute a second-stage payload. The ClamAV detection further supports the malicious nature of the file.

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
758765a8929d8335592b62072ca7540a3aef80000339ba7e45d2d6b2a007bdac		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12273 bytes

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