PDF malware analysis — malicious · 5607b2dd6288a674

MALICIOUS

PDF

26.1 KB

MD5: f804ea4ac58d7bf3dd042bca0259e86f SHA-1: 21406a4ed743de7dbe0461f878c304b4b0059630 SHA-256: 5607b2dd6288a674bcd155b3738fe7049051d740b8cb93667d5a8e8c8f230b46

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known vulnerability via util.printf() to execute a second-stage payload. The ML classifier strongly supports the malicious nature of this PDF. No specific family could be identified, but the techniques suggest a downloader or exploit kit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `d3bc364eac4f278d73a53550dff46f57d92b2dac1350665dc03bedbb7a1a74a3`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3775 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` `6ee806d3d5ebbb961642640b62c41995e80498cd2468d4b5c1a23a8ab8bcfac0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1083	17372 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_obj111713_002.js` `81697b5ff919e3b8f765ef4040c7f9e02face9196e8dfb8181f092f4aa3c35ab`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5495	4988 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` `401efe05f13c24077c33acc2a6ecee9bd35ab7d0596ed78818b2201071a5cf33`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1083	1425 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` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5495	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `a8bc538788cad67c9baa72fa5eeddca1f8c94730f438d9221e468e7f907c5e46`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1083	1811 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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