PDF malware analysis — malicious · 5cbe7b6c7c254f78

MALICIOUS

PDF

23.4 KB

MD5: 8a12abfa27be232a94072c656fe6ae58 SHA-1: 4443b3d68b96c4c37f9baff4a3179b35e2cabc02 SHA-256: 5cbe7b6c7c254f7853d8ad79223cadb765b20e3c8a08d87dc7192cdfb6f96918

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. This script is designed to download and execute a shellcode payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_geticon. The use of eval() and obfuscated strings within the JavaScript indicates a malicious intent to conceal the payload and exploit mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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_collab_geticon

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `fcca380179ef76d561db831695996bb86dacb7de68d0f2dda77a062767f717a2`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3465 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` `0bdc5a68a76872d692df09880c132ff503346c8a513fbe5db9dafa8e5ce73159`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF4D	18197 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` `16cb26bec283aaaa2b0886506ef389eb03f191de88edf9ba5016d4d5c714d7cd`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5698	1755 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_obj111711_003.js` `c2c3d0096f40fcfbc7561091196d7946548425b0a2b44aff9afd101da10944b3`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	23572 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` `311960d5011de1b318d585ce3c4abd4a1b51ce725e07ed9d1a90fa7d9862b6c2`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF71	20053 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 11 long base64-like blob(s).
`javascript_obj111713_005.js` `6bb3cf65933392db516df05716b92abe68e30b172e8dba4ee2fae7d47fde5dd1`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x56BA	1804 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` `ec8c134440a9651f3a45a593845bf208445ebaebf6b126d314c8ef3b6649d4a3`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF4D	1521 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` `0701889f24c2561ad9247cdcded6921ee1072044815ec5f7116dd3d90a3ed337`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5698	106 bytes
`legacy_pdfkit_stage_002.js` `d2b05ba67b44b941cb84503eedd65650cbfaed21411dd1ba49f8659cde99a50d`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `bde5d77c809327b0824360cf491c0c83e3a497484852c70cfb5bc6b4ebc5f53b`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF4D	8251 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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