PDF malware analysis — malicious · 35c9c9ad2f634fc1

MALICIOUS

PDF

4.3 KB

MD5: 6f6ab7ed2f9e9482f505e75ebccdcbb5 SHA-1: 71f9eff529e36e934330812ab59cc12c6c8a68ec SHA-256: 35c9c9ad2f634fc1c437284eeedee661fd2f250c8aad84221d02cc1f5783e079

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2008-2992 exploit, which leverages `util.printf` and JavaScript's `eval()` function with `String.fromCharCode` to decode and execute a malicious payload. The deobfuscated JavaScript stream (`numeric_charcode_stage_000.js`) is likely responsible for downloading and executing a second-stage payload. The confidence is high due to the clear exploitation of a known CVE and the presence of obfuscated JavaScript.

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` `ea259054774f7b5151a0016ed2943db96a9bc7f3a9a9f45a10f856b3dd538f2b`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22309 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` `018b59792dce1983ea9fc904130ea7c732050c4ac81b3a88cafc4cf0bed0dc56`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6579 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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