PDF malware analysis — malicious · 6a81868cfb06bc38

MALICIOUS

PDF

22.0 KB

MD5: 548c10b2cb2b73ec5c4473aecaf1f23a SHA-1: 099f0f1be44db8eda96b0c180a85151d30dccc3f SHA-256: 6a81868cfb06bc38eb207bd86a1c85a2857b98b242ef9b46054fe01e59fddd44

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that leverages the CVE-2009-0927 vulnerability via the Collab.getIcon method. This script is designed to download and execute a shellcode payload from the embedded URL http://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_collab_geticon. The use of eval() and unescape() functions, along with array concatenation, indicates a deliberate attempt to obfuscate the malicious JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
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 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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_collab_geticon

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `8bca72e87ca4ba26ac54a6b0e240e729c9c66d6c08d6f0b36a38a30aa127c82f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3277 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `ea33682313e294ae04708a8ef9f24f3d83bedb4033c24fd8eefdeb4c4b9b3650`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE91	16848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `3b47b7563933fca759131af2664d9c0a60de159e748b7c08aa40879d6011a6fc`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5097	1789 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111711_003.js` `e06337cde8758480b634d823185d643803b4450f92f06f6c337bd9210dc372b1`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	22069 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 16 long base64-like blob(s).
`javascript_obj111712_004.js` `e1024a2881c7472b9a31bd3f6a2de03d9e02453b95efc4e6addb7dc120e17baa`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEB5	18738 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 11 long base64-like blob(s).
`javascript_obj111713_005.js` `0a0bb39bbd032593af385cc3d481c6c41468086a2e581bec39a3500425d9d5a7`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x50B9	1838 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `0f2c6ad3e08fc45c8d4b07dda95a66451877445cc54801516aa2c910ebee13af`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE91	1526 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` `407624ceb11bdfcccd03817d5cc6229f3a3f8dfc15051e1567d07f2b81bcede8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5097	100 bytes
`legacy_pdfkit_stage_002.js` `08f4fd8a991ab0d8f4adec5dd078a878ef7078ea94a4003f17d2447b820a66b0`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `fe7922b10c126d3ce0f56f4291de68f17652dbe0209b69d08e552e13ea1c80ea`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE91	8240 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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