PDF malware analysis — malicious · 867744c7bb7876ef

MALICIOUS

PDF

21.6 KB

MD5: f2e7760a24bae2226f1525c6199aa28c SHA-1: 16bc0cfc8c9a80a2343a2f4885d34aa40c7546a9 SHA-256: 867744c7bb7876efd26758199213805c264179478a9069cc2f154543bf1db861

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 API to trigger CVE-2009-0927. This JavaScript is designed to download and execute a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p2/.l.php?l=1&spl=pdf_collab_geticon. The use of eval() and unescape() functions, along with complex string concatenation and encoding, indicates a deliberate attempt to hide malicious code.

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` `c561dd810e03602780b662cc56b09999e0954379d3d96293bfd2b9a26d058690`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `1259a2dc60f9003ef88718c579844d977ae5fa64aac676c2021aed30e8d279f2`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFBC	16361 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_obj111713_002.js` `01b730f5ebbfef6ffbc69ad917e4d19805e97ecb142958584db8ee63881b5cd0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4FDB	1615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111711_003.js` `835f901214f174eba26d78b36184650bcf51416ee8d869491d6cc49c5448dca9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	21707 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).
`javascript_obj111712_004.js` `37b16180d198b7917486dc15b7c53ea45c6397f0e2023c17981f52d745601e9c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFE0	18077 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `c2b7d3eba45f48001a5ccc37577f62285577a31bba69e66e0761f6d23ab33ca7`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4FFD	1664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `9c7da28834a78dfb2e1afb155c76dc128c377517fd88962b7a258ec00f2dd261`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xFBC	1523 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` `95d52c265d60ffad372da99bb3db5c3f0b48fc84b1aaa90902895f12786cdc82`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4FDB	99 bytes
`legacy_pdfkit_stage_002.js` `52929f4a67065351f804871eb8d087a90f90e05d4ad9dcb6b87508e12915fae7`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1623 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` `37ba43be7e1da609eff46ce489e3cfbf96cd0eea89c4062408721b33c80f82e9`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xFBC	8219 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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