PDF malware analysis — malicious · d726cf7cdfd69e48

MALICIOUS

PDF

20.8 KB

MD5: 247c3f5ce3b89d76db0c10567f6cff00 SHA-1: 4ef6c04e09a5ad3601d0fd632aeff1786f043423 SHA-256: d726cf7cdfd69e4827aa78752fc11451710a5e7a12c788fe0856d782c6e4e668

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the eval() function and the util.printf sink, indicating exploitation of CVE-2008-2992. The JavaScript is heavily obfuscated, but static analysis suggests it decodes and executes a second-stage payload. The presence of multiple JavaScript streams and deobfuscated JS files further supports this. The primary attack vector is likely the exploitation of a PDF reader vulnerability to achieve arbitrary code execution.

Heuristics 5

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
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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `69a20631cb7ca4d861bc157bb3be1fda2fad21ce15f4cebcb2e659b46ccd90af`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3681 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `6419b77b9c91464ebafc30ede18aa7828132eac46447b586326e45548815e866`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1025	12249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `5a4e3a984e9af220f7c3fa46124b7c91e07e048d532c8bbb1b2c640414925b59`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4034	4764 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `a63d87f2b143513c65d1743d1dc1458eace0797e16ff17319fa0a362817b3dff`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1025	1413 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `9e7de6a38910840104d463e0d53d1b4d0d19da47f16d5075572f05e5f7dd4b42`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4034	387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `21767be84889121248b9fe8f7106e35da27fb1e29ec8eddb4b63f045d9a79ca9`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1025	1801 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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