PDF malware analysis — malicious · dfefb4718136cb1b

MALICIOUS

PDF

4.0 KB

MD5: 36f56db56f04a1b1cb2f37cb2dfe704f SHA-1: 91945e571b424901c21ecf860c54c63494fab17b SHA-256: dfefb4718136cb1b4ebe69a09a44d5f20977b6fc7c6b55beefb5af71af7e3318

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 exploitation of this vulnerability via util.printf. The deobfuscated JavaScript stream, numeric_charcode_stage_000.js, likely contains code to download and execute a secondary payload. The presence of JavaScript actions and embedded JS streams within the PDF structure further supports this attack pattern.

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` `da897ca757b433d109df81285fb8c1670ecee7f01fc44ff65657cf679904cc56`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20346 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` `b3b5753682883e1f4a47703d5c38038f9471fd472ab9071a7e2783f794585edc`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6019 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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