PDF malware analysis — malicious · 8dc4ccfb6b753a63

MALICIOUS

PDF

4.4 KB

MD5: 9eeee20a1083dc6a0381f2928adc86c1 SHA-1: 622257858670c74823b9e0c2ce0e8cd5d00257d8 SHA-256: 8dc4ccfb6b753a6337c1b0ffd6e23a2adf4e052b41d71bd12da5b15cf4fcceec

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell 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 use of util.printf to decode a numeric character-code string, which is then evaluated. This suggests the script is designed to download and execute a second-stage payload. The extracted JavaScript files, particularly 'numeric_charcode_stage_000.js', are likely part of this malicious chain.

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` `06f310c7888c68d2c20b27f3d6cacd24c0d71e22f0258c3add6923b53a9531e6`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23269 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` `712fcb25c0aaae2cd65ebb5c19ff43ad9c95c2235b71c91a186cf3a7c6c7ae0a`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6823 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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