PDF malware analysis — malicious · 6f4c7ec211bb9cfc

MALICIOUS

PDF

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

MD5: 89bd767953c674428034b9dac2da02f9 SHA-1: 9af3481bed2b64d45632872ea93b464d2c376947 SHA-256: 6f4c7ec211bb9cfce23e842f63a660bd419ced1a4b3552e621f3da707209b2d6

370 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to download a second-stage payload from the URL http://ontilop.ru/.../. The script is heavily obfuscated but ultimately attempts to execute shellcode. This indicates a malicious PDF designed for exploitation and payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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. (matched in decompressed stream)
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 (matched inside decoded stream)
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/.../

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `6d1059ab96f8c91630330a2cae8bed6fd994d8273eb0b038cf4822db5ce79b06`	pdf-javascript-stream	PDF /JS object 13 at offset 0x35E	1690 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`combined_document_js_000.js` `c55d35077a31da3aba3a76ffae782a5ee6bd28078b91c692cdc2cfa629a429e9`	deobfuscated-js	combined document JavaScript streams at offset 0xF	1703 bytes
Detection ClamAV: Pdf.Exploit.Agent-34657 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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