What is the purpose of pdftool.dll in Windows?

My event log records that pdftool.dll threw exception code 0x0000005 in an MS Access application. I would like to know what the code might have been trying to do. Does anyone know what pdftool.dll (in C:\Windows on Win 10) does? It does not seem to be from Microsoft or Adobe. Details tab of properties show no description, Product name, Version or file version.