PDF malware analysis — malicious · 405265b96b653a1d

MALICIOUS

PDF

13.1 KB

MD5: 90c6d8450d875137840da7bcd8504e0a SHA-1: 169a620e3dc2ab4c6ba381bf3cdf1e75843f2537 SHA-256: 405265b96b653a1dd240e361d77ee5aeba57f95a92ddbae8b4aa6420fa2a91b1

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes a binary-XOR stager. This stager is designed to exploit CVE-2007-5659, a known vulnerability in Adobe Reader. The exploit stage is recovered by XORing binary digit strings and then evaluated, indicating a likely download and execution of a second-stage payload. The presence of JavaScript actions and embedded JS streams further supports this attack vector.

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` `aa1b9be678be4a49cca87c456588e0dc376bae9ed7dea795ec0146b9639b7e59`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78268 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` `883307980f1d77840bd5d8b1cb4b3c7b198a0c52d80dc6193ef46fd003930653`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1306 bytes

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