PDF malware analysis — malicious · 99cb50e2cd4effd8

MALICIOUS

PDF

4.3 KB

MD5: b19fd70526b18bfe4fc995deda25b205 SHA-1: 307a2314a104e566c821294915ef11052419d85d SHA-256: 99cb50e2cd4effd8a57c7c13e3db5a4d44f9ab88ed5ceaa42797da0021f5280a

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. Critical heuristic firings for CVE-2008-2992 suggest the exploitation of a known PDF vulnerability. The embedded JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a secondary payload, which is a common technique 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` `6fe1170c4ef9b3c4aed4c25d3813fc54f5ffa18cc7fd7f3829b8b0e176de361e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22372 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` `1bce8fa87a9a152deff49c3bcb60b155bff16fca177345246f83971f7331e363`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6596 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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