PDF malware analysis — malicious · 64f47ca3d8b9b4fd

MALICIOUS

PDF

40.0 KB

MD5: 8d9f1c83b0cb3b59e18a01a4c40e453e SHA-1: c40dd5a0a9a65e3709237b13d27a2826027a05ff SHA-256: 64f47ca3d8b9b4fdfd56795367ce70d0af350250b6aec53275d66eacced134a2

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 second-stage payload from the URL http://edsmt.com/new/post.php?e=8&&. The JavaScript is heavily obfuscated but the heuristic firings and ClamAV detection confirm its malicious nature. The primary goal appears to be the execution of arbitrary code via the exploit.

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. (identified after JavaScript deobfuscation)
ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
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://edsmt.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` `784598ac726efbc5b8e2c0bdac52b5d94377374a7652a0a7cafbc6acba619129`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2019 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely
`javascript_obj0008_001.js` `bb78ef90da6c1d75aedb79d3c5422a9280ee64ec7608f12e94dffb56f98fb984`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	40427 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `6615bafdfca3443f4e226384bdb5b622622cea29fad1cb3aad6a924ef5787e9e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x9FE	2540 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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