PDF malware analysis — malicious · a385a9adecb08514

MALICIOUS

PDF

4.2 KB

MD5: 1a11a7e82704969a63b4315ed6cbe97d SHA-1: 2019477591e4aa5dc1df5b1536ae1edd739b3d17 SHA-256: a385a9adecb0851488c1fd8795d73ef6ae86a21def8a20689492c8f6f13b4de9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of this vulnerability via a numeric character-code string decoded JavaScript. This script is likely designed to download and execute a second-stage payload, as suggested by the suspicious extracted JavaScript files.

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` `b705fac707bf616f689e92f08c87b0ed992e3b01863174bba5ae8170ecf72424`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21369 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` `6bbe61135a0602c008ad64420c22291552c6b19cf6c5d03a07356972a18d2c6a`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.