PDF malware analysis — malicious · fd1034ef9bc35de3

MALICIOUS

PDF

4.4 KB

MD5: 76a6308ae8c42dc9cfb370ba521542f7 SHA-1: 0f690e874d38475785f4ac83531036a4fb6cfd7a SHA-256: fd1034ef9bc35de3604a2771a6d56b0c6a29ea06e8937293dfb1c8386ee2cd12

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a PDF vulnerability to execute this JavaScript. The deobfuscated JavaScript, numeric_charcode_stage_000.js, is likely responsible for downloading and executing a second-stage payload, although its specific network activity is not detailed in the provided evidence. The presence of extracted JavaScript streams and the specific CVE exploit strongly suggest a malicious intent to compromise the user's system.

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` `d932c6775ad412d39289ec70b6182063bb4d959c1b1f4e34916c156c1a333a36`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	24004 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` `b3006e59459d43552e5ef0837b3e53b68b5b96d4d0699fa01935261a47a07d5b`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	7056 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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