Malware?! "assistive technology like a screen reader"
I'm running OS Catalina on a MacBook Air onto which I have installed the latest version of Adobe Acrobat Reader DC. When I double-click on a PDF document, a box pops up entitled "Reading Untagged Document with Assistive Technology" that tells me that "assistive technology like a screen reader may be running..." It goes on to say the document must be prepared for reading with assist technology. This concerns me and I always click on cancel and I can read the document. Should I be concerned? Is there something on my Mac that could be allowing others to read what I have open on my screen? I have the option of clicking a box to not show this dialog again, but have been reluctant to do this.
MacBook