In Xpdf 4.05 (and earlier), invalid header info in a DCT (JPEG) stream can lead to an uninitialized variable in the DCT decoder. The proof-of-concept PDF file causes a segfault attempting to read from an invalid address.
"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-47857.json"