Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee18426cfe8071b4…

MALICIOUS

PDF

12.8 KB
MD5: dcd81b20c79e4380c4bbd1cf07330697 SHA-1: b5093eff2282a386c609dd5df5788819fcd741ef SHA-256: ee18426cfe8071b46040971bf0a7815e2bef3b3ed30617b17d04d244899d1773
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution

The PDF file contains XFA (XML Forms Architecture) which is known to be susceptible to heap spray exploits. Heuristics indicate the presence of XFA heap spray exploit code and embedded script payloads. ClamAV detection confirms this as Pdf.Exploit.Dropped-78. The embedded file artifact suggests a secondary payload is likely dropped.

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.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
5edb9e5036f4b5b619c0e1d9f46701e696ffb5cb6664a09081c24e850d0d706e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12336 bytes

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