Where did you get the PDF? Suggest your contact whoever created the PDF and ask them for a new version that does NOT require Flash Player which is ending on Dec 31st.
I created it from indesgin And that's after export pdf Interactive
Given that Flash Player is EOL after Dec 31st, I sure wouldn't build anything that uses Flash.
Do you want me to move your question over to InDesign?
You can download Flash Player plugin used by Acrobat at https://helpx.adobe.com/acrobat/using/flash-player-needed-acrobat-reader.html.
However, as OP states, it's advisable to not embed Flash Player in PDF as Flash Player, in all forms, well be end-of-lifed at the end of the 2020.
If you use up to date InDesign it will stop you exporting SWF, I think. Only old versions will hit this trap.