PDF malware analysis — malicious · a34b18d58aeb42e0

MALICIOUS

PDF

4.1 KB

MD5: e15d7f03a50a6aa0a64e094c3338d8fd SHA-1: 42f67cc4f449d10f88998f4cf1ae33a00550f830 SHA-256: a34b18d58aeb42e0e6570ab8b16f66d8ebcb8dd5a9c33d4adc7123a4b03c9b65

128 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 uses `util.printf` and `String.fromCharCode` to decode and execute obfuscated JavaScript. This script is likely designed to download and execute a second-stage payload from a remote source. The presence of multiple JavaScript-related heuristics and the specific CVE exploit strongly indicate a malicious intent.

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` `7be6210172fc02d948d04e86b908c60f5c9a5e12abad24928c954ac86c65a209`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21146 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` `30566309d01701a3bcc1e97508b412e676c941bff9f14ba61717da034bc989e3`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6226 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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