These are the parse exceptions thrown when attempting to do so:

Tomcat
======

org.xml.sax.SAXParseException: Character reference "&#db82" is an invalid XML character.
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.fop.apps.Driver.render(Driver.java:498)
at org.apache.fop.apps.Driver.run(Driver.java:565)
at com.atlassian.confluence.importexport.impl.PdfExporter.generatePDF(PdfExporter.java:159)
at com.atlassian.confluence.importexport.impl.PdfExporter.doExportEntity(PdfExporter.java:140)

Orion
=====

org.xml.sax.SAXParseException: Illegal XML character �
at org.apache.crimson.parser.Parser2.fatal(Unknown Source)
at org.apache.crimson.parser.Parser2.fatal(Unknown Source)
at org.apache.crimson.parser.Parser2.surrogatesToCharTmp(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeReferenceInContent(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.parseInternal(Unknown Source)
at org.apache.crimson.parser.Parser2.parse(Unknown Source)
at org.apache.crimson.parser.XMLReaderImpl.parse(Unknown Source)
at org.apache.fop.apps.Driver.render(Driver.java:498)
at org.apache.fop.apps.Driver.run(Driver.java:565)
at com.atlassian.confluence.importexport.impl.PdfExporter.generatePDF(PdfExporter.java:159)
at com.atlassian.confluence.importexport.impl.PdfExporter.doExportEntity(PdfExporter.java:140)