PDF / .PHP malware analysis — malicious · 8b415cb67b6e3336

MALICIOUS

PDF / .PHP

13.1 KB

MD5: f7408aeec6f06643d4df0c4a8ccdab09 SHA-1: 4174183a2add0010a7b6fd1ab1b3da338794bd24 SHA-256: 8b415cb67b6e33361205d2009bfece5276d03494d213c8de7c65d78c96bd6c4e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that utilizes the `Collab.collectEmailInfo` method, a known indicator for CVE-2007-5659. The JavaScript is further obfuscated using binary-XOR encoding and `String.fromCharCode`, typical of stagers designed to download and execute additional payloads. The primary attack vector is the exploitation of a vulnerability in Adobe Reader.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `5118bb58e2d8b89d90b7fe9ad69eb4df84dce00b4cf09e21a42220b303a884cf`	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` `39e53429b6b3e3df6fd8c935d36fe0ce42f48edd7bf9d0da942e733a30877bd6`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1294 bytes

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