PDF malware analysis — malicious · 81b0cebec56482e2

MALICIOUS

PDF

4.0 KB

MD5: 7d968ce7d525607b783c7bc37364dd12 SHA-1: 73488b51a4dfe601c1c3f3b374507e5be27f133c SHA-256: 81b0cebec56482e2fc76d6736c1dbbdabdc565c97f3b85086caf3908fefbf67d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known PDF vulnerability via util.printf, which is used to decode and execute JavaScript. This suggests the primary function is to download and execute a secondary payload. No specific family could be identified.

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` `6b5ace369484fc19047f7abaf9236072f1b5877ca3fd4b25cd30b480e6e2fac6`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21055 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` `a3439e38dc89d819ba2e227d872d41f2a4c0ac23ecd1c910dcb3c4bf7cab9580`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6194 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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