Embedded JS in PDF keep throwing alert reagdring specific version of Acrobat (Spanish and version 5.0 or greater). This happens because: - JS in pdf is enabled - PDF contains some unsupported features (e.g. XFA) Alert come when app.formVersion = undefined || app.formVersion < 5.0 In pdf.js we were using FORM_VERSION = undefined. After researching based on https://opensource.adobe.com/dc-acrobat-sdk-docs/acrobatsdk/pdfs/acrobatsdk_jsapiref.pdf\#G4.1993509 and Acrobat DC we decided to go with the larger number to avoid unnecessary popups. Through investigation we realise that VIEWER_VERSION should have same value - a number. Due to all that, we implemented 21.00720099 as a value for both FORMS_VERSION and VIEWER_VERSION