PDF malware analysis — malicious · 11596eec6de20024

MALICIOUS

PDF

79.1 KB

MD5: c3430090a6f3893924f6383c4a481d03 SHA-1: 3124c7d874d3791a600da8d3605e148b881ebe7e SHA-256: 11596eec6de20024eaef69fe661cb214e431d6fcbfd1a19b7525b5a139a74361

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2009-4324 via the media.newPlayer API. This script is designed to download a second-stage payload from the URL http://cshis.in/x/l.php?s=newp&&. The presence of shellcode download URL and the ML classifier's high confidence indicate a malicious intent to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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 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://cshis.in/x/l.php?s=newp&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `b0ec39ec3763c9740a43eb6a97e16144ba97d3cdbf98f248b6ac3fa0926e81cc`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`javascript_obj0008_001.js` `423e82b0ea8e4941b37d9d933e16a2020fcb734bfc2a6d83e79979a08a483565`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	80451 bytes
`legacy_pdfkit_stage_000.js` `dbb326f9ab28c24e745edc41cf3827e86e38227fd6b1b28860c777c5d18f5ae1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x101A	2552 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` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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