PDF malware analysis — malicious · 1db56b1422bbc7b0

MALICIOUS

PDF

4.4 KB

MD5: 81d5ba508e020032a6f3c980cda72cf1 SHA-1: 3dbf9c7615e43e64ccc8220523dbcb228792b224 SHA-256: 1db56b1422bbc7b055d10da01394b1f434acb84c957bae94eb694a733d334916

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, including a critical CVE-2008-2992 exploit that utilizes `util.printf` to decode and execute JavaScript. This script is designed to download and execute a second-stage payload. The presence of `eval()` and `String.fromCharCode` further indicates obfuscation and dynamic code execution, typical of malware delivery mechanisms.

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` `e813dad94b31316e3ebd669ec1ed9c3f9f6df4933f577c215df418cb1e759921`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22936 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` `3510bf356f37733b224cff10348c2b97589b87f0421ccee400145407ac7c76db`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6753 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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