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//For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
// initialize PdfFormat
PdfFormat PdfFormat = new PdfFormat(Common.MapSourceFilePath(filePath));

// use one of the following methods
// method:1 - clear custom properties 
PdfFormat.ClearCustomProperties();

// method:2 - clear custom properties
PdfFormat.DocumentProperties.ClearCustomData();

// save file in destination folder
PdfFormat.Save(Common.MapDestinationFilePath(filePath));