Fortify - Apex Scan

I am trying to run a scan with 17.10 on an Apex code base. I followed the instructions in the User guide but am having issues extracting the custom objects from Salesforce. When I run the sf_extractor tool, I get the following error message: 

Connecting to https://test.salesforce.com/services/Soap/u/37.0Number of sobjects: 574
Number of sobjects to process: 573
Number of sobjects to process: 572
Number of sobjects to process: 571
com.sforce.ws.ConnectionException: Failed to send request to https://*redacted*.my.salesforce.com/services/Soap/u/37.0/*redacted*

at com.sforce.ws.transport.SoapConnection.send(SoapConnection.java:121)
at com.sforce.soap.partner.PartnerConnection.describeSObject(PartnerConnection.java:1356)
at SObjectExtractor.retrieveInfo(Unknown Source)
at SObjectExtractor.main(Unknown Source)
Caused by: java.io.EOFException: Unexpected end of ZLIB input stream

Has anyone else encountered this issue?