PDF malware analysis — malicious · 611c6b37f08375d1

MALICIOUS

PDF

21.3 KB

MD5: 507ccd81ba9ae326f0e47393261cd593 SHA-1: 5b715548d7f1fc4f1c9634fd8925a004017612f7 SHA-256: 611c6b37f08375d15268dc91e43db061b5427a19403e2967e064c7f1a26edc15

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains obfuscated JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. The script is designed to download a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_email, as indicated by critical heuristics and ClamAV detection on extracted artifacts. The use of eval() and unescape() functions, along with string concatenation for obfuscation, is a common technique for delivering shellcode.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
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_email

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `62b066ab606667332ab18e0d8f26a0142e04af255980b6d1d443bfa2f75e16d3`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3124 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` `4f30e40ed77a057059d17ae6b1d3b03d38cee6bf7c82c2023b7f8dd02990ff08`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDF8	16564 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` `095d7902d87d98d164bbf144970e367534841d1f8490ef22e1ece95ec6e07364`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4EE2	1555 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` `0806be9ae171c04a0c596b4a71ef11df51e0e1c6ede76316d1c70e459112d9fd`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	21398 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).
`javascript_obj111712_004.js` `aa5f93903a96ddb69d11ed689c2e6ea6b49b56475abb91222512004b8fba99f5`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE1C	18220 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
`javascript_obj111713_005.js` `587bddd878932a0f0c0d2886ad505c65fec1f0a227f9eb5c1f56fdad7f9f7f76`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4F04	1604 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` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDF8	1469 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` `f8988193c0f87a8c8917c8e654ead761d9eeea64321f891356f23e2f96f3a580`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4EE2	89 bytes
`legacy_pdfkit_stage_002.js` `4673594660fd504d4aeef616e1d60cc0e8e24bb79242ab542309ad107d99de8e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1559 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` `9fa9bd1d08c27c4ad351e273879f441cc0dfca952b9f583108738b6df5e83985`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDF8	7889 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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