PDF malware analysis — malicious · f5af53eb1a6e53ea

MALICIOUS

PDF

13.1 KB

MD5: 42456782d937d0cf52518804ae1da808 SHA-1: 63e8202c244f2d2e102d5b47b6852d6838f8fcda SHA-256: f5af53eb1a6e53ea49b93c726da72c198cbc55491b70d0ab281d474e85cccbf4

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1190 Exploit Public-Facing Application

The PDF file contains embedded JavaScript that is obfuscated using binary-XOR encoding. This script exploits CVE-2007-5659 (Collab.collectEmailInfo) to download and execute a secondary payload. The presence of a binary-XOR JavaScript stager and the specific CVE exploit indicate a malicious dropper designed to fetch and run further malware. The ClamAV detection further corroborates the malicious nature of the file.

Heuristics 7

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-7324336-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7324336-0
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `4111401ebad46e28558c07304521d8e22b1ad6ae5f2eccdf03459ac9625404c7`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	77692 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `0fd8851cb2bc39359de7e53cbb91c5648ec98e4c892ce573ed92c3c021a4862d`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1294 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.