PDF malware analysis — malicious · 56b882be270f52a2

MALICIOUS

PDF

24.4 KB

MD5: b6ab36d47ca4f117a93c0e8f9502241d SHA-1: d5597108aa18b370d15d9bc80f2fc957c076c5b3 SHA-256: 56b882be270f52a266eaef81e83556b996034d374991ae1bb2e14e2bfab4a326

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1059.007 JavaScript

The PDF sample contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and unescape() for obfuscation and execution. The critical CVE-2008-2992 heuristic specifically points to the exploitation of a known Adobe Reader vulnerability via JavaScript. The deobfuscated JavaScript stages suggest the primary intent is to download and execute a second-stage payload, likely leveraging the reconstructed string "eval()" and "unescape()" to achieve this. No specific family could be identified, but the exploit chain is clear.

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` `434420957d684f9ca10ecdb44093fa5180ae5727e2dadc3ff2bc4ebeed322b08`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3726 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` `b690f8341547375da5ade4dcec67c710dd6dc0044446dbfe75d2036940c32e75`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1052	15534 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` `ae71d5b788b7798c5019559d42e62d8a0a978b43191f6461439aae2641e860e2`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D36	5167 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).
`legacy_pdfkit_stage_000.js` `2ce519949289064cac4d9ec5e2f03616b7ef69d371aebd8dd98fe04454eb0f63`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1052	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` `e73b452a7201d77c6fec22600d1f996d6d9f13115e195c977a28d6e94e336575`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4D36	388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `4865f9c6fc75a59d49b7eb7fb390e8711042b2bd7123f390cee85fe25e8dc903`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1052	1802 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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