PDF malware analysis — malicious · 725d3c22c835693d

MALICIOUS

PDF

3.2 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 3ce5f7a76d2d90fca91797103503c4f1 SHA-1: e478ab21494e09fa2b70cee55e3ffd7186d3bc97 SHA-256: 725d3c22c835693d843ac65fe3950acbb75e1a88a2a8ea8a3c966c7c9de0b487

410 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 using the Collab.collectEmailInfo function. The script is designed to download a second-stage payload from the URL http://ontilop.ru/.../fi. This indicates a malicious document intended to compromise the user's system by executing arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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.
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.Agent-34657 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-34657
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://ontilop.ru/.../fi

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_001.js` `c6fb7503bd5b2f7e7a6b31db47546f6f8e12e341f55a50c0e83a4c2770e0c309`	pdf-javascript-stream	PDF /JS object 12 at offset 0x32D	1709 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0012_002.js` `0ad847acf789a182fb79977395645bc5d050e62e461d39179fe685801734d902`	pdf-javascript-stream	PDF /JS object 12 at offset 0x34F	2403 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `bd21e8d3cafe0930efc301497cb60da39bf6d212a19be3ab1099d2cdb44a0406`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0x32D	1703 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `900f0fb8e1d2032aa32b3bad8c7d5ce1ce2dc8299fa8d169960d60b5346af576`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 12 at offset 0x34F	2397 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `26ebc23ad23d088ca26ab755cff44f6c4d7570e2f41ad7311a3c700b49e8f37d`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0xF	4119 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `8189ccbf8c92df57bbe040b7f4bc5500354926f865682d04532703b31baab202`	deobfuscated-js	combined document JavaScript streams at offset 0xF	4131 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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