PDF malware analysis — malicious · 6a95b0ba11b2a674

MALICIOUS

PDF

79.1 KB

MD5: 82e488d0fc6129b85c4061b75afb322c SHA-1: ea9df32aaf3334e75965b39e44c2d0d5d596772f SHA-256: 6a95b0ba11b2a67435e40c6eb6ad1e77abe673b85889da51a61ed35b032d329e

210 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 using 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 URLs and critical heuristic firings strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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)
ClamAV: Pdf.Exploit.Agent-21205 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-21205
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` `0ed5e7aac6e07d5c71333c89eefdee8e4dcc3e7dc96287cb42892070d6314a08`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3583 bytes
`javascript_obj0008_001.js` `2b2ce661a433db6bbcb5e9ad6fcc355773db7b3ff3efac947847d0e48a892662`	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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