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Aside from returning it I would do a factory reset once it's charged, then install and run ESET for android
Certainly "pup" is a reference that such an apk may be adware, and in my opinion, it is the type of virus you have least to worry about, it is easy to detect and eliminate
Adware means a virus that constantly displays ads while you are using your phone, and by the way,, "risk" certainly simply means risk, so it is just a risk of being a virus, certainly false positive.
In case it is adware, antivirus like eset are good at eliminating adware.
Other than what @BobbySon123 said, you can also install ESET antivirus from play store and scan your device. If eset detects them to be malware, it will be able to remove them (even if they are system apps).
Install something like eset antivirus (or similar) to the phone and run a scan to see if it finds anything. If it does remove whatever it finds. If all else fails wipe and reset.
The ESET Mobile Security app does something like this. Not sure if you mean reset as in wipe data (like a factory reset), or reset as in literally reboot the phone, but this app does the former.
You can also lock the phone and play an alarm by sending a text to the phone.
https://play.google.com/store/apps/details?id=com.eset.ems2.gp&hl=en
Install an antivirus? I've found malware on my S8 before. ESET is good https://play.google.com/store/apps/details?id=com.eset.ems2.gp
ESET Mobile Security & Antivirus...?
Also, Cylance Mobile Security was recently made available
You won't be able to use special high security sensitive apps (mainly work apps). Definetly use antivirus with mobile banking (I use Eset Mobile Security) and you can hide root so bank apps work fine. NFC payment works fine for me.
You can use firgerprint but in some ROMs I'm unable to use it for PayPal. Repairing Knox is hard (i didn't search for it) and if you unlock bootloader I think there is no simple return to warranty state.
If you flash TwouchWiz ROM you can use GalaxyApps and gifts.