We apologize for the inconvenience caused if you are getting error 109 when opening a PDF file, chances are the file is corrupt.
If you have downloaded the file, try downloading it again. If you created the file yourself, try creating it again from the original source. That may be all you need to do to solve this problem.
On the other hand, there may be nothing wrong with the file itself, but your PDF reader may be having trouble making sense of it:
If you are trying to view the PDF in your browser, save the file to your desktop and then try to open it with the stand-alone Acrobat Reader. Sometimes the browser plugins cannot handle large or complex PDFs, or third-party software has corrupted the browser plugin, rendering it useless.
You may have a newer PDF file, and an old version of the Acrobat / Reader. Try updating your version of Acrobat/ Reader. This can solve many issues, including security issues known to exist in earlier versions of Acrobat software.
You can also try saving the file as .ps file and then convert it back to pdf and check.