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Yes this is possible, but: You should be much more specific, because triggering an action can mean at least 1000 different things.
Here some quick and dirty examples made with Muse:
Normally, PDF is no web format. You can download a PDF document (fillable or not), but you can’t display a fillable PDF within your site "out of the box". You can find one of the most powerful PDF embedding widgets here: https://www.j-26.com/tools/pdf/pdf-embedder-premium/