Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef730b35a25f3f59…

MALICIOUS

PDF

12.0 KB
MD5: 1ad8d98dd61b59dd5c7a5a205608c310 SHA-1: d14705a2fd8e02c89563a474a35196a17dd046cd SHA-256: ef730b35a25f3f5922039242872fece075bffa2a2ae7fe8f11d0d112e1a9ef19
226 Risk Score

Malware Insights

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

The PDF file contains XFA form elements which are known to be vulnerable to heap spray attacks. Heuristics indicate the presence of exploit code and a script payload designed to deliver a secondary malicious file, as detected by ClamAV as Pdf.Exploit.Dropped-78. The ML classifier strongly supports a malicious verdict.

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
31d9eb0fa5168474ff89bfb9ea07e2d34ede367ab892662aee0446060f57ed1a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11525 bytes

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