PDF malware analysis — malicious · 949720e83bc746ab

MALICIOUS

PDF

13.2 KB

MD5: e8d631b44c16c28bf6c776e9c77bf2cf SHA-1: 9a8128cafe817629db75aa5163dfb928887389d6 SHA-256: 949720e83bc746ab83fb07810c67d3d43a52936851576538c180f328ecc19555

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes a binary-XOR stager. This stager is designed to exploit CVE-2007-5659, specifically targeting the Collab.collectEmailInfo function within Adobe Reader. The script is heavily obfuscated, making its exact payload difficult to determine, but the exploit itself is the primary indicator of malicious intent. No document body text was available for analysis.

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` `8e2ae35b7dba6e8fd465e366f255130e1bb257aec97c00ada3f45299cb58f924`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78268 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` `883307980f1d77840bd5d8b1cb4b3c7b198a0c52d80dc6193ef46fd003930653`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1306 bytes

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