Several times, I’ve posted stories about folks being burned by the release of overly revealing PDF documents. By not properly saving or converting documents, sensitive metadata can inadvertently be accessible.
But there is a difference between recognizing a potential problem and knowing how to avoid it. If you use MS Word, take a look at this guide by the NSA entitled, Redacting with Confidence: How to Safely Publish Sanitized Reports Converted From Word to PDF. It covers the different types of exposure and gives step-by-step instructions in MS Word and Adobe Acrobat for removing data.
Source: The ever useful, PDF for Lawyers