PDF malware analysis — malicious · cdb1fb59cb39d75d

MALICIOUS

PDF

4.0 KB

MD5: 225308389f3d857dd9b6ce04fd5282b5 SHA-1: a095e7e5100443e849552cca8fe47ad0b89959dc SHA-256: cdb1fb59cb39d75dcc8ef044d73a4aae61c0d15b5bbb9de4727d1ff4e88eac61

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode() functions. The critical CVE-2008-2992 heuristic indicates that the PDF launcher concatenates info fields, extracts characters at a fixed stride, and evaluates the result. This strongly suggests the script is designed to download and execute a second-stage payload, a common technique for malware delivery. The specific exploit used is CVE-2008-2992.

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` `5f430ecdc38af369363d978cc6bd7de39026b3992b8b048e4ba4afc2f15e549d`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	19820 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` `870a0c4e0fe4aecb7c51795a7cd97f6e9fbf04c8234eca5e24984865a04e6b65`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5841 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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