Adobe Acrobat reader android app icon on play store is not following the below Google play app icon design specifications. App icon edges should not be rounded. Google Play Store dynamically applies corner radius. This ensures consistency when the icon is resized across different UI layouts. For more information, please check the below links and attachment.

Google Play app icon design specifications

https://android-developers.googleblog.com/2019/03/introducing-new-google-play-app-and.html

https://developer.android.com/google-play/resources/icon-design-specifications