PDF malware analysis — malicious · 604cada5c27107d9

MALICIOUS

PDF

101.9 KB

MD5: 7e2111b0af2b4b86f5b12fad90959b9d SHA-1: 40e85aa653b0c017504711041632cb5978ad4687 SHA-256: 604cada5c27107d9c33e2e01aa7d11f6d2672be735a0a702bb51736f45ed59ad

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a malicious PDF that leverages embedded JavaScript to exploit CVE-2009-4324. The JavaScript contains obfuscated code that resolves to a URL, http://wordpresscashsecrets.com/cancershape/and/p.php?e=8&&, which is likely used to download and execute a secondary payload. The ML classifier strongly supports the malicious nature of this PDF.

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://wordpresscashsecrets.com/cancershape/and/p.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `8a9f2ff71915e8d784f0ff846c6fa95ef40ff36e8000efcd2ddc54b42d6f52c8`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2578 bytes
`javascript_obj0008_001.js` `2047abf1a77f4f119b48d8610728bff422f4602b1e751941928d1d69314f98da`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	103831 bytes
`legacy_pdfkit_stage_000.js` `5696eede220c60b3123817fcfba8a93ae510a2fbbd62709e5da58b96bb20a88a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC2D	2804 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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