PDF malware analysis — malicious · 247dc6085f18ec3d

MALICIOUS

PDF

4.0 KB

MD5: 98f21c7117b6e1fc7f18d0b57e147583 SHA-1: 7cd86e15762f68e6f0aa293738f89b7762a64291 SHA-256: 247dc6085f18ec3d004f76d7b4fae524ed756043c5a298b1fa196d2292428d0a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF file contains embedded JavaScript, which is executed using the CVE-2008-2992 exploit. The heuristic firings indicate the use of eval() and String.fromCharCode, suggesting obfuscated JavaScript code. This script is likely designed to download and execute a secondary payload from a remote source, although the specific URL or payload could not be determined from the provided evidence. The attack pattern is consistent with a malicious PDF used for initial compromise.

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `e78efa6a8d76f8ba7c3f3238a9035ff855c65db961a83103c225166fd7a904a4`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21056 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` `a3439e38dc89d819ba2e227d872d41f2a4c0ac23ecd1c910dcb3c4bf7cab9580`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6194 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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