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FTR:

In Acrobat Pro, you can also use JavaScript with PDF forms and action wizard. The most common uses for JavaScript in forms are formatting data, calculating data, validating data, and assigning an action. Field-level scripts are associated with a specific form field or fields, such as a button. This type of script is executed when an event occurs, such as a Mouse Up action.

To learn how to create JavaScript scripts, download the JavaScript manuals from the Adobe website. Developing Acrobat®Applications Using JavaScript™ contains background information and tutorials, and the JavaScript™ for Acrobat®API Reference contains detailed reference information. These and other JavaScript resources are located on the Adobe website.

https://helpx.adobe.com/acrobat/usin...ipts-pdfs.html

It’s not the same Devil that you or your browsers know.