PDF malware analysis — malicious · 6da4c5efab6bf97b

MALICIOUS

PDF

24.4 KB

MD5: 75216c87f280bc30d0fa4939aeb23a60 SHA-1: e790ac8c9559a229100f1c8ecf56dd0895200ce1 SHA-256: 6da4c5efab6bf97b0a579d2cce357121090b3c214b863a368e3d210853f33a11

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exploits CVE-2008-2992 using obfuscated JavaScript, a known technique for client-side exploitation. The embedded JavaScript contains a URL, http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_util_printf, which is likely used to download and execute a secondary payload. The ML classifier strongly indicates maliciousness.

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` `cf009a53b0d7d2888fca00353a72d6a70aedeb4259825e3b20074353019a6e43`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4109 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` `d07b075c7c22d8bc9e84626a62f14598a8209f157577a09ae1dcf3044f874827`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11D1	14855 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_obj111713_002.js` `c311c01addb2f3237919e5bfe860355d45ec90afaad31126fa30f7d022e1e219`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C0E	5444 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` `521e43eba0d499eb3c2e519264fba672bde0402042b749fb70f53fb15f73fda1`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	24564 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` `34e09db1df59a9819fe155f310c86fb1f99669c91404c9683645afeee83b96b6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11F5	20401 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `9daaef229b801352003ac25249fd78fa21f9cde2f1aa6e6750ddd15185bdcdd4`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C31	5493 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` `a9bd720854cdcf46b057f8e141e3ecae75abc3a62289c064f417a7b440584cb4`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x11D1	1414 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` `df2e8f38acbcede11c3621c62802a425613ee3b105933e1debbf6452a55bb89f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4C0E	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` `2d4a071668a51d8486bb58d7f3b89290899fb16fc7febccc52044c4d2342f9be`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1799 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` `333789492b3011034b0c8923a6d287f3fe290b654a3560da57a4fe2e2ab796b4`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x11D1	9384 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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