iudq.dll is a dynamically linked library. In simple phrase, it is an essential component of a particular parasite. Most threats depend on such libraries and wouldn't work without them. The iudq.dll file can be responsible for the dangerous payload a parasite carries, so deleting it will definitely reduce all the security and privacy risks.
The iudq.dll file is installed and used by adware
AdGoblin.
In some cases a presence of iudq.dll does not mean that your system is infected. The file may actually belong to some fully legitimate applications and therefore must stay intact. If you are in doubt, please scan the iudq.dll file using you regular spyware remover or antivirus program.