PDF malware analysis — malicious · 9c1351f4bec5e5ec

MALICIOUS

PDF

4.0 KB

MD5: 715ac985dcbb88a475031f55fe33356d SHA-1: 2e1ad4ada62e4f63ec877bcc201e244188e6f4a1 SHA-256: 9c1351f4bec5e5ecd9ef16f563bd39f8a32546dd8c0aa863911bd86bbeeb9e28

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2008_2992 heuristic firing suggests the exploitation of a known PDF vulnerability. The presence of eval() and String.fromCharCode calls within the deobfuscated JavaScript stream (numeric_charcode_stage_000.js) points to code execution and likely payload delivery. The extracted JavaScript files themselves are listed as IOCs.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `d6599e83eff960cd89dc1ffd1e3b9cdc74610c4fc826a71de1a2cbfadbd54386`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	19821 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` `870a0c4e0fe4aecb7c51795a7cd97f6e9fbf04c8234eca5e24984865a04e6b65`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5841 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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