Can files from a malware-infected Mac be safely transferred via flash drive?

Beachy40 wrote:

Can files on old. 2014 Mac Air using Big Sur that's infected with malware be safely transferred by flash drive? Or will the files contain malware too?

[Re-Titled by Moderator]

Would not be better to Remove the Malware Before taking any chances ?

What makes the User ( you ) believe there is Malware on the computer ?

Details and context would help.

Adware and Malware can affect computers and are often downloaded from “shady” websites or developers who inject them into downloads.

Source: User tip from @Kurt Lang

What is malware? - Apple Community