PDF malware analysis — malicious · 4238365bde4b94d7

MALICIOUS

PDF

26.5 KB

MD5: 046973be425a692bfff93e9fe7eeb2f8 SHA-1: 0e615edd12e1a7b3d5158b18cbea9787c907fe42 SHA-256: 4238365bde4b94d7f45daee6e9c6b76f98b2365283e8cde33cdd679bcac03274

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to obfuscate malicious code. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known Adobe Reader vulnerability via util.printf. The embedded JavaScript streams and deobfuscated JS files suggest the primary goal is to execute arbitrary code, likely to download and execute a secondary payload. The reconstructed string literals like 'eval', 'unescape', and 'String' are core components of the obfuscation and execution mechanism.

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` `1d2893fee5511ddbf895b17b1d509c31b8c2596a413b42346e5bb5784e5de004`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3958 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `471adc73e7290b9930e4c8dd4d548d3eb0bda301f12baf3c57a7ef423dd980e2`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x113A	17036 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` `6e23d1cbaae6c5391b2334910d4cb8935e1df639c662edfb96676fd92ba28973`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x53FC	5571 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` `2ce519949289064cac4d9ec5e2f03616b7ef69d371aebd8dd98fe04454eb0f63`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x113A	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` `78fa916ec9c401d0ee0edd291d516b233c50607815246c42d696fb422389683d`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x53FC	390 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `c04b05dbb0191f1333fd206e991524b1afde6bfee5012d811cc55b03f2167822`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x113A	1804 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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