PDF malware analysis — malicious · 283b845e020877ca

MALICIOUS

PDF

74.0 KB

MD5: ea0a599448d2ce32bdd8028b6d2e2b22 SHA-1: 0d23d6e674b34aed42671012eea430e2ba9e68b0 SHA-256: 283b845e020877ca7a05a67acfbdab2ae74644201e43714f008b9d5f54fa923e

166 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 a binary-XOR stager. This stager decodes embedded strings and executes a payload, specifically targeting the Collab.collectEmailInfo method to exploit CVE-2007-5659 in Adobe Reader. The recovered JavaScript is designed to download and execute a second-stage payload, indicating a downloader or dropper functionality.

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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_obj0004_000.js` `9498f6bba1815a604fb52c9a7094c4f7891ec1a635b9792a26cb992a0937dde8`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	75418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `9060594addd4a0f2cdc299d96b97cc8368a521fadf73320f5ec9ee3ae46da391`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1225 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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