PDF malware analysis — malicious · be5089f9f022d384

MALICIOUS

PDF

13.3 KB

MD5: 73d422fb7116a71675f89a4e5e715225 SHA-1: a6f2f88df5bb166519a1079c8b346afb88f1b35d SHA-256: be5089f9f022d3847830577fc89fa6a377aeb31f77134094d4b24016a3ff987b

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified as a binary-XOR stager, which leverages the 'Collab.collectEmailInfo' function to exploit CVE-2007-5659 in Adobe Reader. This stager is designed to decode and execute further malicious JavaScript, likely to download and execute a second-stage payload. The presence of multiple PDF-specific heuristics, including obfuscation and exploit indicators, strongly supports this attack pattern.

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` `87491fd22f49b317b43f4ac6df9fbc0e909491b79f91e61552d9ce8c02f71470`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79420 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` `0e2847928382593b4ed1f5b21f97789d14d37dad90e772de0c3d8786f424b5ad`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1330 bytes

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