PDF malware analysis — malicious · b6f7174918ea958a

MALICIOUS

PDF

4.3 KB

MD5: 8417d0b9dbcd0705e5b8590b3a8e5495 SHA-1: 69b4314c876dc02e43c0169551a41c8d1fcfb87d SHA-256: b6f7174918ea958a10a71431125fa38a56c4b521e39ab3c4816b8707f403e4df

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. A critical CVE_2008_2992 heuristic fired due to the presence of util.printf, suggesting exploitation of a known PDF vulnerability. The JavaScript stream utilizes eval() and String.fromCharCode, common obfuscation techniques for executing arbitrary code. The primary intent appears to be the execution of a second-stage payload, likely downloaded from a remote source, though no specific URLs were extracted.

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` `b84083d5f4b9d03a3bd75e2a01cedb3f08c2715e60d2746b17bfb2725f671c2e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22145 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` `68e8dba90282af11205d5fd40ecb331fd3f1285f8dc88062bdb26cfec0ce1b12`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6524 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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