Center line become solid line after convert .PDF from .drw file

Hi Gents,

I am using Creo 4.0

• In .drw file hole center line looks like perfect. shown in below Fig 1

FIG:-1

• After converting .pdf file from .drw its looks like solid line shown in below Fig.2.
• Is there any way to show center line as same as .drw or similar. 

FIG:-2