PDF malware analysis — malicious · 2650720ed03bf3f6

MALICIOUS

PDF

24.2 KB

MD5: fc774b2d4764d61eff0ebf8bb8a3c4c5 SHA-1: ae6d649eae8c3b1500d978883ac11ea06ea713f3 SHA-256: 2650720ed03bf3f656bcf112a47a05493e400567dd41b8e171c5083f01afa9c3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes the eval() function and the util.printf sink, indicative of the CVE-2008-2992 exploit. The heuristics indicate that this exploit is used to execute obfuscated JavaScript, which is likely responsible for downloading and executing a secondary payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `0c6e52d4af3e1b1efe19ae3d4b95266ed08567fb988dc77bea2fdf7c192096b9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4331 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `ec2088413f81e400e134ec37dc39fda12db6c5a94703c5695560a301b7f8b1e1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x12AF	14707 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `9077e4ec6d78a36cec504ff5ca1d99419e9e46ca1a9b4bb11273bfac9fe121bc`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C58	5200 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `2ce519949289064cac4d9ec5e2f03616b7ef69d371aebd8dd98fe04454eb0f63`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x12AF	1413 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `34feebbbf0ee64a52f53dce0c98530b4b073203d6a605ba6fc0e3a735084f8c8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4C58	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `1b2a6c4da45584179b6fdb2144423038d0333983b59b60a24548059a3369bf31`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x12AF	1798 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.