PDF files can run JavaScript. It's used in a lot of fillable forms. https://opensource.adobe.com/dc-acrobat-sdk-docs/acrobatsdk/pdfs/acrobatsdk_jsdevguide.pdf

PDF files can run JavaScript. It's used in a lot of fillable forms. https://opensource.adobe.com/dc-acrobat-sdk-docs/acrobatsdk/pdfs/acrobatsdk_jsdevguide.pdf https://opensource.adobe.com/dc-acrobat-sdk-docs/acrobatsdk/... https://opensource.adobe.com/dc-acrobat-sdk-docs/acrobatsdk/pdfs/acrobatsdk_jsapiref.pdf https://opensource.adobe.com/dc-acrobat-sdk-docs/acrobatsdk/...