PDF malware analysis — malicious · 13452debb1487246

MALICIOUS

PDF

6.6 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: 3522bf081b5d0ba29992c5950ee32a4f SHA-1: 287529e3f54c7a6139121bf9485198c51b593f8e SHA-256: 13452debb14872464f7ee08b977f1e1b96a587d411e12cd415bf2ac77ead7102

330 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple critical heuristic firings indicating exploitation of known CVEs (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) via embedded JavaScript. The JavaScript is designed to download a second-stage payload from the URL http://www.chamberwellmanor.com/ida/exe.php?exp=pdf. This indicates a clear intent to execute arbitrary code from a remote source.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-22625 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-22625
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.chamberwellmanor.com/ida/exe.php?exp=pdf

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `e73d6d4fe17c2e4bff828e458a82b7a95c43abf868f09815aa1f22c0c9325671`	pdf-javascript-stream	PDF /JS object 32 at offset 0x361	304 bytes
`javascript_obj0034_001.js` `a4bace101bf2305c54743b78b8b59d9085e0d6229a384e53057f87ced0656091`	pdf-javascript-stream	PDF /JS object 34 at offset 0x466	421 bytes
`javascript_obj0036_002.js` `2306edf0737c2e3a9be387b0de741509fa69ecce20f7e37cbeabb3f9c3af9180`	pdf-javascript-stream	PDF /JS object 36 at offset 0x7C	278 bytes
`legacy_pdfkit_stage_000.js` `1bffff4fdcf3e06591fc481eda0067f58a266bad55926cd9b4fc0643cd975eb8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5B8	1664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `60a3ebcd330ed8e2e496a7c053d2ed5fb26c06a0ce51b78fedff3e5aa602cb92`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xBD2	1824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `91c592eac316060c3af708dc7600760eefdd7b522dde044befeb0ff79ff45af1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x11BE	2986 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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