PDF malware analysis — malicious · 61bb373188c62cb0

MALICIOUS

PDF

8.4 KB

MD5: 88e045ff304baba8c1ade3f4db5e0dee SHA-1: f1e6ceb240b9fe8b8e150b7612bbd19f0ae86127 SHA-256: 61bb373188c62cb013b0254d3f73461ea99fbd3fd6d171db0be7db3d776cc2e1

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that is obfuscated and uses a known exploit (CVE-2007-5659) to achieve execution. The JavaScript is designed to download and execute a second-stage payload, as indicated by the heuristic firings and the nature of the extracted scripts. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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)
ClamAV: Pdf.Dropper.Agent-1638004 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1638004
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `509b3be2d8769a21ebc122727b5cb53085708ac85036abd114ef8571b6f14516`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	47 bytes
`javascript_obj0013_001.js` `f7996b968ec3961238f6614a14f2e6f66047ef26304ee3b18c0272e2f61c7bcb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x375	17497 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `c8bdef46f9ce63b52c9b556eb1b8887a53acd5405e1e18a2e8cb985c261fab0b`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x375	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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