If you expand the log "box" you will find your answer.
These are password protected files which avast has no way of knowing the password. There are many reasons software authors protect there products.
One is to prevent tinkering and their copyright. Most, if not all, security software is password protected, avast is a good example, as are firewalls, etc.
The fact that they are password protected does "not" indicate an infection. Basically you can leave them alone. They will be scanned by the file and behavior shields upon execution. Password protected and archive files are by nature inert and pose no harm.
May I suggest running a scan with default settings.
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