PDF malware analysis — malicious · 7271cbc6c9e3608e

MALICIOUS

PDF

15.9 KB

MD5: 973e2cb9e1f70d0f5516cccb0404b1eb SHA-1: 6a3526ec81ece696d860015ad8e430cb5d8fdd4e SHA-256: 7271cbc6c9e3608e50ec31e5a3485e44e379eb78299efcdb049e4ac84ab36936

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that leverages the CVE-2009-4324 vulnerability. This script is designed to download and execute a secondary payload from the URL http://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_newplayer. The use of eval() and unescape() functions, along with complex string concatenation, indicates a deliberate attempt to hide malicious code.

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/.p2/.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` `ec7ffdf282f363f9f22ae31895ebc097fca54736a682933a63f0a86fbd8b0ffb`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3275 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` `b89b6f22b53f0a59279c4a27f5bd36b53ced0db509e1e1f09d7883725df753bd`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE8F	9872 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` `7557fd54d20efa57be7d2f4d573da50ccdeb6c1293d1f50b6d1c69eec1feb4ea`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3555	2552 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` `929a9ab9f2abe78676ba420e3271416ed145300b73d0fee647f036a8b9bf0dde`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	15855 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` `53be19347d600ae01aff86d1c5ed6dc6e65e0ebbf49aeafb7f450a3319a4ec2e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEB3	12526 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` `a950ed2894893b9cf2278fc6b9131eba7e4518ba63de9589b13a404498ddacf7`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3578	2601 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` `14d9d23d619682a659b666d1537fbe47a8cc4db49b0c37d63714847d39b24a42`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE8F	1080 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` `cd7088aa0ba5ce42db7faac79c4063dccc339c8953139714658e9cb6b07c91fc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3555	165 bytes
`legacy_pdfkit_stage_002.js` `5a28b8a1cf9038e2d391edb32c4472d4fc2910cc98f13fb214bfea8bff177a49`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1246 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` `66839ffc4f951a01cbff51f65060fa8e3d61384a6f605c5192a429e63b1fc407`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE8F	6400 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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