PDF malware analysis — malicious · 6d9b1cfa8b8c60f6

MALICIOUS

PDF

26.0 KB

MD5: 24d2525da24911a925bc77d2cc52cd23 SHA-1: c08226d77966376263affdd7e9775706c0ffdb2b SHA-256: 6d9b1cfa8b8c60f6f5c1b4dd521ba0edf70e47468d82ec78b1d45768a309001a

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains JavaScript that leverages the CVE-2008-2992 vulnerability, specifically using the util.printf sink. This JavaScript is designed to download a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_util_printf. The use of eval() and unescape() functions, along with heavily obfuscated string concatenation, indicates an attempt to conceal malicious code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_util_printf

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `4088d32e35ef88088c3af867ff9cea6f44f707deb97b13f625206982de8e5bbe`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4041 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_obj111712_001.js` `1f2293441739409c8efcb503dd1f12588106956fdb2e0c2ff0dca7b81c5b3e7f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x118D	16911 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` `6862005aa4f8660df128320fbe463c9c0178b4377f907167f8aad0d3faf59c54`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x53D2	5127 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_obj111711_003.js` `4dad9d029dae35c8f09b32611512ad572c1065ee570122828fb1e63a87aa576e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	26235 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).
`javascript_obj111712_004.js` `6dadffca0ef51d1663acf2bb10ba9a80db2935464d80f1ec07e4c73093d206f6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11B1	22140 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).
`javascript_obj111713_005.js` `9e9ead21bf7a8fbc47fa684cefd14b88e4fefcfd868d9ef129599e9cb1b8bfcf`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x53F5	5176 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).
`legacy_pdfkit_stage_000.js` `2ce519949289064cac4d9ec5e2f03616b7ef69d371aebd8dd98fe04454eb0f63`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x118D	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` `34feebbbf0ee64a52f53dce0c98530b4b073203d6a605ba6fc0e3a735084f8c8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x53D2	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `1b2a6c4da45584179b6fdb2144423038d0333983b59b60a24548059a3369bf31`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1798 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).
`legacy_pdfkit_stage_003.js` `41425a4b737a690fce509adbdb4e7d27e2fa2cd135f69edcc051edc51acd8498`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x118D	9379 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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