Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ac31d7895b2bd3…

MALICIOUS

PDF

12.7 KB
MD5: 36894dad057ff4e0571faaf9a4f33c37 SHA-1: e3025774e40c90eae7f89f14e1c1196e493f0c5e SHA-256: e8ac31d7895b2bd3a2b8105a35fa074f44ac3addbb98064ed1d38f52f5e880e3
226 Risk Score

Malware Insights

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

This PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The critical heuristic 'PDF_XFA_HEAP_SPRAY' indicates that exploit code was found within an XFA stream, designed to trigger a heap spray. This is further supported by the 'PDF_XFA_SCRIPT' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics, suggesting the XFA form contains executable script intended to deliver a payload. The ClamAV detection 'Pdf.Exploit.Agent-6136306-0' confirms its malicious nature. The exact payload or delivery mechanism beyond the exploit itself is not detailed in the provided evidence.

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.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
3e996f21a7b3beeb99d96f60711d3231818e7b5d2107bf2baa37710c16903622		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12237 bytes

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