Adjust Logging level for apache commons logging?

I have a simple console app which uses apache's PDFBox library, which in turn uses commons logging. I'm getting a lot of junk messages in my console which I'd like to suppress:

Feb 15, 2011 3:56:40 PM org.apache.pdfbox.util.PDFStreamEngine processOperator INFO: unsupported/disabled operation: EI

In my code, I've tried to reset the log levels to no avail:

Logger.getLogger("org.apache.pdfbox.util.PDFStreamEngine").setLevel(Level.OFF);
Logger.getLogger("org.apache.pdfbox.util").setLevel(Level.OFF);
Logger.getLogger("org.apache.pdfbox").setLevel(Level.OFF);

Despite these settings, the messages are still showing up on the console. Retrieving the log object from Commons logging doesn't help either, since it doesn't seem to have a way to set the level.

Is there a way to suppress these messages programmatically? Or do I need to add a config file?