PDF malware analysis — malicious · 03837b3024176740

MALICIOUS

PDF

22.9 KB

MD5: f11c8a80403a3525129cb5c673ea2a71 SHA-1: 3b615d9638b107873bea077924ccba5406e91339 SHA-256: 03837b30241767402cbcf37fc7eedcba4b38fd95607220fa82951978caaee047

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 Collab.getIcon method to trigger CVE-2009-0927. This exploit is designed to download and execute shellcode from the embedded URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_geticon. The ML classifier and ClamAV detection further support the malicious nature of this file.

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/.p/.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` `07adadd62d820ae50bf4c8502b5a4c6af12310e96b9b59878c142e5212dea4b6`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3490 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_obj111712_001.js` `5b813a30bdccfb545df3cfb06deb83f5e63970cd041ccc8b5fcc3fe7535380cd`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF66	17638 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` `45aaeca6709a371ea01fd54aa966f948cc05134c21ec95926a8562e87b3a1a77`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5482	1737 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` `0de3bb6c950f3dea4eb3d0c9e284c65b3359750f5e210307f33cdbc9459b8cbe`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	23020 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 17 long base64-like blob(s).
`javascript_obj111712_004.js` `6fa1bf13d6e21b4adec3e606dabeca2b1f871cef886eb0d45443480128a72548`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF8A	19476 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` `6214811811bb69c3f6271f1906191664008567e8af68cbd6c1d3ab96ff2e1a17`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x54A4	1786 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` `f89df567ac1524aa97d7d1c2e318640fc4fa1525d608905c9904da2f1b756863`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF66	1520 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` `83ed833e0bfe81760cdafa3101687c332246e47824afa8ed3f542aa301010a10`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5482	106 bytes
`legacy_pdfkit_stage_002.js` `1ce33ff6a7d3f36b6efd127d1be38c7f658a62964349ccb4e6fa1b5c451ba106`	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` `4becdc1b2d1b763db0ba1904b1fbeea8afec409e0a5bac72db27645348fb1a89`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF66	8246 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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