PDF malware analysis — malicious · 731c6a07e22608be

MALICIOUS

PDF

1.4 KB

MD5: 8ffe148a4a94213082d3b9fc65c7ecf1 SHA-1: c631e234d01138dcb091c3413126581202449832 SHA-256: 731c6a07e22608be67494f4dae4a088acf2dbfe0d68f26de914effd25eaffffb

250 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324 using the media.newPlayer method. The script is designed to download a second-stage payload from the URL http://www.vesen.in/x/exe.php?src=&id=&x=pdf4. The ML classifier strongly indicates maliciousness, and the presence of exploit-related heuristics confirms the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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. (matched in decompressed stream)
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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://www.vesen.in/x/exe.php?src=&id=&x=pdf4

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `ed214d008ca7f8fad0affc792159f2b30ce479dc90c5348e0751937c74ebe0c2`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	291 bytes
`javascript_obj111712_001.js` `69f731635b128db3b348060a688bc05ff578236780d4e409c598c1d7d9a039d3`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x2B2	948 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj111713_002.js` `d2f98bec78aa096efa5aca99b701d5e6b9a8e2cf728fb7e79bf248862bacf14b`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x508	70 bytes
`combined_document_js_000.js` `1ba5e9a8547bb14d9aed30ee8b48995d0d946c7c6426ddc9775999ce337bbcf9`	deobfuscated-js	combined document JavaScript streams at offset 0x197	1311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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