Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b60aaa74ceff230…

MALICIOUS

PDF

12.2 KB
MD5: dba1b1ad49e1ca892d165894153556dc SHA-1: 03b915496bba5a5ab5495500d91226134dec3e3d SHA-256: 9b60aaa74ceff230bba55262e4998607e87d8b26946fe6b01e116a9f5fb4ab9e
226 Risk Score

Malware Insights

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

The PDF contains XFA form elements which are known to be vulnerable to heap spray attacks. The critical heuristic 'PDF_XFA_HEAP_SPRAY' indicates the presence of exploit code designed to trigger this vulnerability. The embedded file and ClamAV detection further confirm its malicious nature. The primary attack vector appears to be leveraging the XFA scripting engine to execute arbitrary code.

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
e31a2b252aa6f6a8deeee387d3129ad6b9889efaf06c0684e03fba6668d07a04		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11763 bytes

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