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It doesn’t need to be opened with any specific app. Android lets you set default apps for different file types (this is determined by the ending file name characters after the “.”). Since you’re on GrapheneOS, you’re probably privacy-conscience and would be wise to stick with the app included with the OS. This behavior contrasts a user who heads to the Play Store and goes with any PDF reader willy-nilly.
My dad needed a CT scan this evening and the local ER’s system for reading the images was down. So they sent him via ambulance to a different hospital 40 miles away. Now I’m reading tonight that CrowdStrike may be to blame.