Clamav detects Trojans

I have just scanned my system and clamav has detected a few suspect files:

File: .cahe/mozilla/firefox/jqxk4r44.default/cache2/entries/750B6E2F1286....
Status: PUA.Win.Exploit.CVE_2012_1461-1

File: .cahe/mozilla/firefox/jqxk4r44.default/cache2/entries/F099C33HJ45J....
Status: PUA.Win.Exploit.CVE_2012_1461-1

File: .config/libreoffice/4/user/basic/Standard/Module1.xba
Status: PUA.Doc.Tool.LibreOfficeMacro-2

File: Downloads/nodejs/node-v8.9.4-linux-x64/lib/node_modules/imurmurhash/imurmurhash.min.js
Status: PUA.Win.Trojan.Xored-1

How likely is it that these files are real threats / trojans?