PDF malware analysis — malicious · 3bedfda772260996

MALICIOUS

PDF

4.3 KB

MD5: 7fd76dc5f2db678e4743581ff5ddcde5 SHA-1: 8ad98535c57a4ddce393057d020463c6a2eff897 SHA-256: 3bedfda7722609964f727ce9fd8cf0d79f00c9afaf3070976770fabace40603c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is obfuscated and utilizes eval() and String.fromCharCode. The critical CVE-2008-2992 heuristic indicates the exploitation of a vulnerability related to util.printf, likely for arbitrary code execution. The deobfuscated JavaScript stream, named 'numeric_charcode_stage_000.js', is the primary artifact responsible for the malicious behavior, likely downloading and executing a second-stage payload. The lack of specific indicators for a known family leads to an 'unknown family' classification.

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` `e3535cda500b0480a7190d1b4dcc357bcc61bfa5861c798afbb833a3ec962f34`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23699 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` `65504202bff45264df095df4c1fbcdd0de7ddde1b86766fdb8cfea94094f4c7f`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6979 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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