Since there is no product called “Adobe” can we reasonably assume that you mean either Adobe Reader or Adobe Acrobat? 
Quite often, AutoCAD produces lines which are very thin in weight. I suspect that when printing directly from AutoCAD, AutoCAD artificially bumps up the thickness such that those thin lines are visible in print.
What may be happening is that when you create PDF from AutoCAD, those thin line weights are going directly “as-is” to PDF. In some cases, being given a line width of zero which is the equivalent of “one pixel in width.” One pixel in width on a 600dpi printer is 1/600 of an inch in width and 1/1200 of an inch on a 1200dpi printer.
The only reasonable way to fix this is to bulk up the line weight using Acrobat Pro's Preflight facility. In particular, there are single fixups labelled Set minimum line width to 0.14pt and Set minimum line width of multicolored lines to 0.25pt under the Page Contents section. Or you can create your own Preflight fixup using the Increase line width primitive fixup. The result would be a PDF file with lines that are thicker (if they are beneath the threshold set) that will visibly print. My recommendation would be to try this first on a copy of the original PDF file so that you can adjust to meet your needs.
- Dov
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Since there is no product called “Adobe” can we reasonably assume that you mean either Adobe Reader or Adobe Acrobat?
Quite often, AutoCAD produces lines which are very thin in weight. I suspect that when printing directly from AutoCAD, AutoCAD artificially bumps up the thickness such that those thin lines are visible in print.
What may be happening is that when you create PDF from AutoCAD, those thin line weights are going directly “as-is” to PDF. In some cases, being given a line width of zero which is the equivalent of “one pixel in width.” One pixel in width on a 600dpi printer is 1/600 of an inch in width and 1/1200 of an inch on a 1200dpi printer.
The only reasonable way to fix this is to bulk up the line weight using Acrobat Pro's Preflight facility. In particular, there are single fixups labelled Set minimum line width to 0.14pt and Set minimum line width of multicolored lines to 0.25pt under the Page Contents section. Or you can create your own Preflight fixup using the Increase line width primitive fixup. The result would be a PDF file with lines that are thicker (if they are beneath the threshold set) that will visibly print. My recommendation would be to try this first on a copy of the original PDF file so that you can adjust to meet your needs.
- Dov
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