Unable to see the changelog from code search hence cc'ing Owners from "chromium//src/third_party/pdfium/OWNERS" folder 

Assigning to ochang@ to confirm if this is same as  Issue 594904  and fixed by Pdfium  Issue 404 .


Note: Seeing 2 other variants of Crash state and test case also which could probably be same and fixed by Pdfium  Issue 404 
1. https://cluster-fuzz.appspot.com/testcase?key=5940034055700480
2. https://cluster-fuzz.appspot.com/testcase?key=5310099121242112

ClusterFuzz has detected this issue as fixed in range 379054:379821.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6661732577050624

Fuzzer: libfuzzer_pdf_fm2js_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: UNKNOWN
Crash Address: 0x000000000000
Crash State:
  CXFA_FMNegExpression::ToJavaScript
  CXFA_FMEqualityExpression::ToJavaScript
  CXFA_FMExpExpression::ToImpliedReturnJS
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan&range=375725:375769
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_asan&range=379054:379821

Minimized Testcase (0.03 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv96MopwIk79fa894GGspONunHLB3VJ-g_Xlbso-Togf6AKORqejQwBkXLLJSHWRS4nWlDzkM3bSUaw0cLJUCoEhey1dCBNZF6ORoAD4ueWTPLBlnGWbTlIeIPRYClMHeMP9gdJkvM9r3pcF6ezaexaRMB-j91w
-()==:ne;f>endfor:';*;;;fr;"*�*


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This was already fixed.

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