One way would be with sed:
mv 'file' $(echo 'file' | sed -e 's/[^A-Za-z0-9._-]/_/g')
Replace file with your filename, of course. This will replace anything that isn’t a letter, number, period, underscore, or dash with an underscore. You can add or remove characters to keep as you like, and/or change the replacement character to anything else, or nothing at all.
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