PDF malware analysis — malicious · cbe01b5f296de7d8

MALICIOUS

PDF

13.2 KB

MD5: 60a4e3056b62e90c5a6ba1cd5f36ef08 SHA-1: 15af9da622ee8cb6b38f2f80e0606611124dd267 SHA-256: cbe01b5f296de7d8869b37e7cf36fa3d38eb32ef66afb5b8ccdf871b52f3eb96

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains obfuscated JavaScript, detected as a binary-XOR stager, which leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This exploit is designed to download and execute a second-stage payload. The presence of this specific exploit and the obfuscation techniques strongly indicate malicious intent.

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` `6ad91be1a7c4e86ccd04f00860f1b02c514ddfc3a8ae71788f6a70a5142fbd50`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78556 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` `4fd1de754d5cbfb13325d7f641b85a861dd4e60a490ccd6733c27a708ccefc92`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1312 bytes

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