Have you tried the obvious way:
just use a bit of copy and paste in the code ( i haven't tested this)
Sub SaveInvoicePrint ()
' Print
ActiveWindow.SelectedSheets.PrintOut From:=1, To:=1, Copies:=1
Dim NewFN As Variant
' Create the PDF First
NewFN = "Macintosh HD:Users:Erik 1:Desktop:Brin:Racuni2017:RacunAvt017:" & Range (“C5”).Value & Range("E2").Value & ".pdf"
ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:=NewFN, _
Quality:=xlQualityStandard, IncludeDocProperties:=True, _
IgnorePrintAreas:=False, OpenAfterPublish:=False
' Increment the invoice number
Range("E2").Value = Range("E2").Value + 1
ActiveWindow.SelectedSheets.PrintOut From:=1, To:=1, Copies:=1
Dim NewFN As Variant
' Create the PDF First
NewFN = "Macintosh HD:Users:Erik 1:Desktop:Brin:Racuni2017:RacunAvt017:" & Range (“C5”).Value & Range("E2").Value & ".pdf"
ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:=NewFN, _
Quality:=xlQualityStandard, IncludeDocProperties:=True, _
IgnorePrintAreas:=False, OpenAfterPublish:=False
' Increment the invoice number
End Sub