PDF malware analysis — malicious · ea3faeecbbd39f7f

MALICIOUS

PDF

4.3 KB

MD5: 436b4d85293b3961ff7457a0ec93f369 SHA-1: 5dccbbbfa5c17d9cee180677388f49888de7e5de SHA-256: ea3faeecbbd39f7fa2ab1dbd04a9bbb5ada2771f52f988a7c08f9ff0775aaef7

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008_2992 heuristic confirms the exploitation of a PDF vulnerability to execute JavaScript. The extracted JavaScript files, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a secondary payload, which is a common technique for initial access.

Heuristics 6

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 (matched inside decoded stream)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `587c2ed6318d63b1efa578545fc3264f7da08c43430f63195672e56a521b010b`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21943 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `981d9c15cc333489135a0de2ced91f10e62460cb481cfda7d7af528d0cbef759`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6465 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).

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