PDF malware analysis — malicious · 5c3d0e19b4c500e8

MALICIOUS

PDF

3.7 KB

MD5: b72bb5f143cfc2a1cd22d278bca44dca SHA-1: 836ea75e528564a0ab9a8a6cf65a5fcc98e036bc SHA-256: 5c3d0e19b4c500e889525fcbf042aa9d3356f705ab57fd594bed7858087afd17

350 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that leverages CVE-2009-4324 and uses eval() and unescape() functions to deobfuscate and execute shellcode. This shellcode is designed to download a second-stage payload from the URL http://inzx.org.in/index4.php?src=58&gpr=11&tkr=11282123997332216&tkri=43068c68e09ae46f0a65b6d73541d7d4&e=8&. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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.
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: Pdf.Dropper.Agent-5785233-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5785233-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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://inzx.org.in/index4.php?src=58&gpr=11&tkr=11282123997332216&tkri=43068c68e09ae46f0a65b6d73541d7d4&e=8&

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `4376115f00d24f0272b8579f4db658fb3f8e371a4df0062bc9db0caf4ac1b2dc`	pdf-javascript-stream	PDF /JS object 8 at offset 0x217	533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0008_001.js` `df36e88d0bcd1bf5c35a817cccb67cbb9746b165b8aee98f8f86b85258bfce7e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x23D	3184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`combined_document_js_000.js` `18e3c61bffd238d65823a451b445c118a4ed073b65093e6d80576cf49517800d`	deobfuscated-js	combined document JavaScript streams at offset 0x217	3718 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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