PDF malware analysis — malicious · 13ddcd22141e3e15

MALICIOUS

PDF

17.9 KB

MD5: dae7ed24ae56d46dbeed2e4d6dded1c7 SHA-1: cdbff9330162b723e6bf3ad2295e7f56007dfd5d SHA-256: 13ddcd22141e3e1538303d963b510a51eebc097c243410313f0a2410cc2b369a

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages JavaScript to exploit CVE-2009-4324, a known vulnerability in Adobe Reader. The obfuscated JavaScript, reconstructed as eval("v"+"ar "+"gg9Z4s3776m"+" ="+" e"+"v"+"a"+"l; v"+"ar"+" r4R05X "+"= u"+"nes"+"cap"+"e;"+"va"+"r "+"k4R9n2J3 "+"= S"+"tr"+"in"+"g;"), contains an embedded URL (http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_newplayer) which is used to download a second-stage payload. This is a common technique for delivering malware via malicious documents.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (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_newplayer

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `22cb7aa26266b552461ceabd291976d0b39687ee7846efcb757c681e45b7a84d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2713 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` `0fa6debfb240ac73b9991a826602f283bfa43607ad5c16de6aa5871b4748bdc8`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC5D	12535 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` `d08d02c020eef6eb21f5aa0b454ecd65778ac76751b2c9f92139b4f9739ca268`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3D8A	2462 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` `ab64edfd9ffc4d2f8728aa91a961b94b2cfe68b98c91eec2034c16da248ae766`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	17866 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).
`javascript_obj111712_004.js` `9144932098a9da8a4ccee8b63704b21e25badd0897f4fca0b9fc3e362a51552c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xC81	15099 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` `25933b6c816f8932b37bf66a26f9a337551fbe42fecd85bf7d9505fc614a26f5`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3DAD	2511 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` `48660bf8064b6ec6f630159fd6942f521374420fb77ecb273c75cae5ae97ce7f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xC5D	1079 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3D8A	165 bytes
`legacy_pdfkit_stage_002.js` `23bd442248ff84436264dced9bb910486275f16b7b8d726beb4aecb43474a484`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1245 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `36b8b21d4ff09b98e2da1a186fc933ab009fd835c4aca2c26514b4e0de5ac438`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xC5D	6395 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).

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