PDF malware analysis — malicious · 76d521af34064374

MALICIOUS

PDF

20.8 KB

MD5: 480b20d8ebba98c515d622b05372676f SHA-1: fcbb9ef8928c08d5b96a2870b3269861a2639e95 SHA-256: 76d521af3406437462bfd2da0ebcca32a45a133562d31f8c0d5b9bf84bd4ab35

270 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 to download a payload from the URL http://usvex.com/new/post.php?e=8&&. The JavaScript is obfuscated but appears to construct and execute a command to fetch and run the second-stage malware. This is further supported by ClamAV detections and ML classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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. (identified after JavaScript deobfuscation)
ClamAV: Win.Trojan.Agent-36170 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36170
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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://usvex.com/new/post.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `4e12f7bf64acc9627f4cb366cf55e8962e089eb3a05120c13ee9cf9478e3eade`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1783 bytes
Detection ClamAV: Win.Trojan.Agent-36170 Obfuscation or payload: unlikely
`javascript_obj0008_001.js` `8fab88f145c8053b515a6e060968d7bdf371e0f41e18cdc08f9b3478ad057305`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	20751 bytes
Detection ClamAV: Win.Trojan.Agent-36170 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `c2a1dcf21f26daa1d838f6892d1edeb089e4639e09fad16c0d2eb5a074ceb4a4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x912	1244 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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