I hope the following code may be help to you, i am creating the PDF file from RDLC report, my code is below...
Dim byteViewer As Byte() = ReportViewer1.LocalReport.Render("PDF")
Dim newFile As New FileStream("C:\Users\SathishKumar\Desktop\♫ ".pdf", FileMode.Create) 'Pdf save location.
newFile.Write(byteViewer, 0, byteViewer.Length)
newFile.Close()