PDF malware analysis — malicious · e605cd0eb977a15e

MALICIOUS

PDF

4.1 KB

MD5: a8e1d9a874f335359fb7698b5fa64be8 SHA-1: 1e9c7c53f7a31b1fa452299ffe8ed12be6b88fac SHA-256: e605cd0eb977a15eefbf95eb24d096b5aeffcb83173f416f6bfd3d369b0b657e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed via a PDF-specific exploit (CVE-2008-2992). The embedded JavaScript is obfuscated and likely responsible for downloading and executing a second-stage payload. The heuristics indicate the use of eval() and String.fromCharCode, common techniques for obfuscation and payload delivery. The extracted JavaScript files are named 'javascript_obj0005_000.js' and 'numeric_charcode_stage_000.js', suggesting they are part of the exploit chain.

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` `0ba9bbbc307daf2dcfd397ce1ee3a6e3aebdfdc8d430a1cad576bb2a2c529a97`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21111 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` `adfdb3620c769b5b03169735edd49ca5c91d054689422f02ed1256f255f1ada7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6215 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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