Major Description
I do not have a test case, but this method in PDMarkedContent is obviously wrong:
public int getMCID()
{
return this.getProperties() == null ? null :
this.getProperties().getInt(COSName.MCID);
}
if getProperties() is null, the method tries to convert null Integer value to an int. I believe the intention was rather:
...
return this.getProperties() == null ? 0 :
...