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Chinese hackers have unleashed a never-before-seen Linux backdoor
(arstechnica.com)
This is a most excellent place for technology news and articles.
No.
By installing software only from trusted sources (default repositories from your distribution are the safest software you will ever install on linux)
But you can still be infected by virus by other means like opening PDFs or accessing a malicious link, no?
Yes. Opening PDFs might be safer on Linux, but general internet security and practice goes a long way, too. Using a content-blocker like uBlock Origin on Firefox can greatly reduce attack surface on both Linux and Windows as well