Answer by Aliaksandr Kavalenka for Disable PDFBox logging with Springboot org.apache.commons.logging

I think this also should work for log4j2. I use this simple way of disabling logs from specific libraries in SpringBoot applications. You need just add it into the log4j2.xml file.

<Loggers>  
    <Root>
        ****** here is some AppenderRef *******
    </Root>      
    <Logger name="o.a.pdfbox" level="off"/>
    or 
    <Logger name="org.apache.pdfbox" level="off"/> 

</Loggers>