It is very clear that Elves can be malicious.
As for evil, there are numerous discussions on the nature of evil in Tolkien's legendarium on the Barrowdowns (some of which are quite hard to sift through) so it's worth a look in those. I can't link to one but just key in 'evil' in the search and I'm sure you'll find something useful.
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Los Ingobernables de Harlond
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