PDF malware analysis — malicious · 9d787dbab379ec95

MALICIOUS

PDF

4.2 KB

MD5: f8e46c4d8bbf3546460a19e5ffff67b8 SHA-1: 021f8952ca95ddec1a1b1bc55e80d454fbe618ad SHA-256: 9d787dbab379ec952fcf833a9fcc896dc92a462034f5eace3de229c325608b51

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File Execution: User Execution: Malicious File

The PDF file contains embedded JavaScript, which is executed via a PDF reader vulnerability (CVE-2008-2992). The critical heuristic firing indicates the use of `util.printf` to decode a numeric character-code string, which is then evaluated. This JavaScript is likely responsible for downloading and executing a second-stage payload. No specific family could be identified, but the technique is common for initial access.

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` `4be03c68631983e8a4fde7e75418a949a03d489c98745d0cf20dbf83e40c25d5`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20377 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` `fd6dfb8e064360e55c7389b2f50e2b93143ff30ab95f700b2285a9c20b8764ab`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6002 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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