PDF malware analysis — malicious · 8b8c92ea0edc5ac1

MALICIOUS

PDF

13.0 KB

MD5: 688f4eb4bd18e056523b29223fd6c4c5 SHA-1: 5180099eac6fb56197fba4e7f09d9098fdeec8f4 SHA-256: 8b8c92ea0edc5ac13d4a642df2b858316d199b3ae8ad17ce6ccae64360104800

216 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 String.fromCharCode method and binary-XOR decoding. This script is identified as a stager for CVE-2007-5659, specifically targeting Adobe Reader. The primary function appears to be the execution of an exploit stage, likely leading to further payload delivery.

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.
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` `3c1f1d777fb54a793125f58f33d3923a3b079ad6464d451629c1ded64e773071`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	77404 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` `db26b39b6c3be671f9720d8ee01be99e035db9ffd98943735edd8961f9ff8930`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1288 bytes

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