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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
You can try some free Linux antivirus software programs like ClamAV but realistically, as long as you mainly install software through your distro's package management software or graphical app store, you're probably fine.
Although not all open-source software is safe, it's a hundred times less likely to be malicious for the sole reason that it's out in the open for someone to verify, and they'd get busted immediately if they tried something untoward.
For the average person like me, having something like an antivirus is better than not on Linux. Especially since I tend to download various things outside of the default repository (i.e. Ankama Launcher which I've only ever seen as a appimage).
Though your advice is good, I couldn't go through with it without wanting to rip my hair out.