There is no built-in functionality that allows for PDF manipulation.
However there is an community based toolkit Exaprom PDF 2.0 , that contains a group of VIs that allows the creation and modification of PDF files.
After following the instructions in the link above, the VIs included should be located in the Exaprom PDF 2.0 palette as shown below.
Another option is a workaround with the Create Easy Text Report.vi from the Report Generation Toolkit.
There you can create and manipulate a Word report and afterwards save that as PDF. All you have to do is name the new file with the ending .pdf.