PDF malware analysis — malicious · 85fb5d522676d0cf

MALICIOUS

PDF

4.4 KB

MD5: e5bba5f3a28a2d0cb9ce82abd42ab65c SHA-1: d75949014467b5b2f39d5ffd2b49a0ff38312934 SHA-256: 85fb5d522676d0cf9e39f25a7fe5d5f6b2e3a0d4af5e03465c3647c6d9c472ae

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution: JavaScript Execution T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, which is executed using a known vulnerability (CVE-2008-2992). The JavaScript stream is obfuscated and utilizes eval() and String.fromCharCode(), indicating a malicious intent to download and execute a second-stage payload. The specific nature of the payload cannot be determined from the provided evidence.

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` `a711a45fd10329468ddd13dd060943d137434683543afa9caa07c0d7e77eb593`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22750 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` `d261ac16760bc898b4b22720919c9dcb96837ba9421637ca199c4d631de4ee2b`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6691 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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