PDF malware analysis — malicious · bb7c7e36ad25b0fb

MALICIOUS

PDF

75.1 KB

MD5: 764f3382e8173dda476e9322a2479be6 SHA-1: a29806ed071be9d5e8b9878b4a5e74315c1b1be5 SHA-256: bb7c7e36ad25b0fb129c1614241f03adafbc70cb05a709c236720533ac9f4e4e

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes a binary-XOR stager to decode and execute an Adobe Reader exploit targeting CVE-2007-5659 (Collab.collectEmailInfo). The recovered JavaScript is heavily obfuscated, but the critical heuristic confirms it's designed to launch an exploit stage. The primary intent appears to be exploiting a known vulnerability to gain initial execution.

Heuristics 6

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)
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` `23d50b02385c863e2e1ca5fa8cb409a7370882732d9092784bd08be1d06e31ff`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	76545 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` `7a2cf18596355e4f62ad2a74c86a6eb830b8c5f25a82916fff8cb087c59c3e50`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x4B6	1270 bytes

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