PDF malware analysis — malicious · 68b885bcc685c306

MALICIOUS

PDF

24.5 KB

MD5: 00831867c58e9ffce65e3b04dc5a658f SHA-1: 6588e173d88fcfb1433e5a575ec05f9bed496063 SHA-256: 68b885bcc685c306bff98c25c3fa9273ee890ab03f047f7f3b5c5fcb90afb92b

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that exploits CVE-2008-2992 using the util.printf sink. This script 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 array concatenation, indicates a deliberate attempt to obfuscate the malicious JavaScript.

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` `4ac872ee4bac79d00734bfb95d02282c41018a37d92fde35f2eb71d98a821f71`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3907 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` `80184b6e6b814675c7a45db310ae38b1f43483aba7132a1314522da020b14327`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1107	15454 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` `c5f551b2f82d600694df6ed311481a1473fd80b726027493f3bec5cf3a5646ed`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D9B	5155 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` `298aedb3ab8e781aae23d23acc6987e70872660689858a56389fadcba9fddb88`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	24672 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 15 long base64-like blob(s).
`javascript_obj111712_004.js` `fec8a0a5ad2747f524ba5e26c78bf205185aaf1a2c8b7f7aeb903da1084da3d7`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x112B	20711 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
`javascript_obj111713_005.js` `a458eb14e483b806cf7692cd2bc834b48c8b2db626736a1090d21ebc102628de`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4DBE	5204 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` `056960406430a675276ea4a9586acd47b9724744cb88baa62057cb0ad683b143`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1107	1423 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 0x4D9B	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` `5f3c9b418168fefcfe9907db6dd32a9c9f5752f94a176e75b74d9ce8fadb8209`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1809 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` `1fe70ee00bd812cd3828c7111d1d0d0fed9dcb8317fd8531eb091491c54d127a`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1107	9435 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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