PDF malware analysis — malicious · a2891d5e8f69888a

MALICIOUS

PDF

4.0 KB

MD5: b1e18c486932121c3639bbc9372451e8 SHA-1: 9226f022c80801d0031a5fb1923bb348d69e678e SHA-256: a2891d5e8f69888afb997e28b5806072f8ab8c381eb94ff5e5984ad9fadc25df

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed using the CVE-2008-2992 vulnerability. The critical heuristic firing indicates the use of `util.printf` and numeric character-code strings to decode and evaluate JavaScript. This suggests the PDF is designed to download and execute a second-stage payload. The document body is unreadable, but the presence of JavaScript and the specific exploit points to 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` `24f7d6ef48703820dbf1da573edadae3c8d62d94f646dbab3c89439f79b9e316`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20385 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` `e0f55e7994386e6b514dc3bdd3d44bb1ddfaa41f3d50bcd4ee528e1114cca1b2`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6010 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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