Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e855a7660a389b7…

MALICIOUS

PDF

12.8 KB
MD5: 3fc4a2139e72ce083f55d46a4fcf2a57 SHA-1: 183433fc092522ba03506dbea2e7b166c556bbcb SHA-256: 9e855a7660a389b7b68bc76462494f91135e617316fdf9a6b453a591b0cfb07d
196 Risk Score

Malware Insights

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

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. The presence of PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT heuristics indicates that the XFA form contains exploit code designed to spray the heap and execute arbitrary script. This script likely downloads and executes a second-stage payload, as suggested by the ClamAV detection of 'Pdf.Exploit.Dropped-78'. The embedded file artifact further supports the payload delivery mechanism.

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
cc0dd3092cf9ae76776d6bd9eabcaad0924aba1ae79d14ef3414844ff8c18338		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12372 bytes

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