An uninitialized memory read flaw was reported in poppler (fixed in version 0.22.1):
Initialize refLine totally
Fixes uninitialized memory read in 1004.pdf.asan.7.3 
Created poppler tracking bugs for this issue
Affects: fedora-all [bug 917113]
poppler-0.20.2-10.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
poppler-0.18.4-4.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.
This issue affects the version of poppler as shipped with Red Hat Enterprise Linux 5 and 6.
Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.