PDF / .PHP malware analysis — malicious · 20ae443e8cc3237e

MALICIOUS

PDF / .PHP

13.4 KB

MD5: 621804003644288b7bf2a4363470c467 SHA-1: 036efd6dc86b76eb1b70809ad1e0b53d224f2fb0 SHA-256: 20ae443e8cc3237e066be9dc02cd81a4ff9d4c05e412f3568828028016fc008e

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that is decoded using binary-XOR, a technique commonly used to hide exploit code. The critical heuristic CVE_2007_5659 specifically identifies the use of Collab.collectEmailInfo to exploit this vulnerability. The recovered JavaScript is a stager that likely downloads and executes a second-stage payload. The file is classified as malicious with a high risk score.

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` `bea4a99658d6f79f561480a328330baac073033dc18e886a20b1bd07192627ef`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79708 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` `000a9df8d8ad61a604a23653f7e52c30bd502e4f597c529427fdb2ab52f08e24`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1336 bytes

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