PDF malware analysis — malicious · 6cf053cc899ae044

MALICIOUS

PDF

3.1 KB Created: 2008-02-01 07:11:31 -05:00 Authoring application: iText 2.0.7 (by lowagie.com)

MD5: 733ab01173eae18d550d029bf5723949 SHA-1: 420b9f828760ae006135eadead0dada876bd6750 SHA-256: 6cf053cc899ae044b0c190c4906c311a71d074b5fcb060d41931c93acfdd31aa

328 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to achieve arbitrary code execution. The JavaScript attempts to unescape a large payload, which is characteristic of exploit code designed to download and execute a second-stage malicious file. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

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-34407 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-34407
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)
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `6764a0c289c648479180481b79e3da996dac3706639cd7bd31fa6aa234421eef`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	4981 bytes
Detection ClamAV: Pdf.Exploit.Agent-34407 Obfuscation or payload: likely Carved artifact contains 20 eval/decoder/string-building token(s).

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