PDF malware analysis — malicious · 83f3ea4ef20b2251

MALICIOUS

PDF

2.5 KB

MD5: c8ecac906a360eefb4cb20658c0cf350 SHA-1: 3371fd46eee8351bbd16bb4fa5b9fd694ee9a5ac SHA-256: 83f3ea4ef20b2251e9e0d1e6725f5296487dd8642d0d092d604f06995289b176

248 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that utilizes the unescape function and a call to util.printf, indicative of the CVE-2008-2992 exploit. This exploit is designed to execute arbitrary code, likely to download and run a secondary malicious payload. The script's structure and the heuristic firings strongly suggest this exploit pattern.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `10f9feec67b594c99593dbb7436d7269d44762a4cfd59d2559069590c414d2b9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2A5	1604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0007_001.js` `fd389b8fa05172624737b7b8683e3e56f5de6db4e7b5f7ee757fb0500ae25233`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2A5	1041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `6e588a12d47b636099fcdc6b8490350150ce9432ca19d7ca8e292700f2ae9993`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 7 at offset 0x2A5	1602 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `5bcfe10d64eb2fd7e9e38b320613ef9db4f177dbe7f5bc9749f6893a2583733e`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x2A5	2644 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).
`combined_document_js_000.js` `93da0f3d6604c9d720ba6ea2bbd37742b719a296be31ae3b85b40bbd14fa3dfa`	deobfuscated-js	combined document JavaScript streams at offset 0x2A5	2646 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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