PDF malware analysis — malicious · 5e354b603f90ddb1

MALICIOUS

PDF

126.1 KB

MD5: fec9aab471dde00706e2846f1f80ebef SHA-1: b5d16249170dfa2eb24692d4c869169ddf24d268 SHA-256: 5e354b603f90ddb148bd28c7bb1ba235961e79ec994881793511f3bfc550c2b9

410 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains JavaScript that exploits CVE-2009-0927 (Collab.getIcon) to download and execute a payload. The embedded JavaScript contains a URL, http://www.stoned-vienna.com/downloads/PDF, which is likely the location of the second-stage malware. The document body explicitly mentions downloading the 'Stoned Framework' and executing 'Infector.exe', indicating a bootkit infection attempt.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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.
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.Exploit.CVE_2009_0927-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.CVE_2009_0927-1
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.stoned-vienna.com/downloads/Stoned%20Bootkit%20Fram
- http://www.stoned-vienna.com/
- http://www.stoned-vienna.com/downloads/PDF

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `450f1bfbb3588b449e84ae8a6765af6dc28254f0ee9dad5f22181660405c4250`	pdf-javascript-stream	PDF /JS object 7 at offset 0xE9	124776 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `1a5e1bca3cbb53c300d54da06cce813fc923c60281590080ccab464ee6dcf885`	pdf-javascript-stream	PDF /JS object 7 at offset 0xE9	122910 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `609d08fcf05e54137c6a7ede581824677d5350130d9ec43e57e42d24dd9309ac`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 7 at offset 0xE9	124768 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `7380546cb3e8eb0285b44e36761dd3d1bd87b57d9603f200dfe064b4ffd2f844`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0xE9	247679 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `f84bc833e2fa42499141eef2f057f38463681d0d3eb0a70e438ddc3e088fd71d`	deobfuscated-js	combined document JavaScript streams at offset 0xE9	247687 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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