PDF malware analysis — malicious · 377b7e80c87eb6f9

MALICIOUS

PDF

13.5 KB

MD5: f72b60abbe140618cd405d630de1d3af SHA-1: 50595eb83a5b7a5742eb128c007836dd0b0ecd7f SHA-256: 377b7e80c87eb6f991255a362bbb6210a6632405bb4315a3ac4a1b8b4c6fb0f7

186 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 Collab.collectEmailInfo method to exploit CVE-2007-5659 in Adobe Reader. The JavaScript is further obfuscated using binary-XOR encoding, indicating a deliberate attempt to hide its malicious functionality. The primary intent of the script is to download and execute a second-stage payload, as suggested by the 'PDF_BINARY_XOR_JS_STAGER' and 'CVE_2007_5659' heuristic firings.

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` `ec3b3bba898f2b2c8adfde6a30257ef4517494856ae9d05f0c72982131f2832e`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	80392 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` `b0a18414eba3e6216ad778186dc24b159a562e1f2280f50da4151acf5221d862`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1348 bytes

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