PDF malware analysis — malicious · 1b3266b1344dbf37

MALICIOUS

PDF

4.3 KB

MD5: e35adc65f1d5cbe66217aa8feeeb2b53 SHA-1: 2b5b756c4554139164c42708fa15594675a924bb SHA-256: 1b3266b1344dbf3712c18705719a49895596e36aedad62363ebfc0bcbdcb9748

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is obfuscated and utilizes eval() and String.fromCharCode(). A critical heuristic identified the CVE-2008-2992 exploit, indicating the PDF is designed to leverage util.printf to decode and execute JavaScript. This script likely downloads and executes a second-stage payload. The extracted JavaScript files, particularly 'numeric_charcode_stage_000.js', confirm the presence of obfuscated code and exploit attempts.

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` `6217e9533bc60003e0b41202da23755aee718c608a76ff10976ab549b1383385`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23189 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` `6b5219d23a87b39a0bda4cadd494d471b6e5d27d97ffc8b9eb73f7462cda48be`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6808 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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