PDF malware analysis — malicious · f31ea194492ba445

MALICIOUS

PDF

13.2 KB

MD5: 68aa067be6267a323f85b3a2893ddf30 SHA-1: 4d91ff4318f592a44f3521ee987e3a80fe9a0689 SHA-256: f31ea194492ba4457adfdcf7d4bd1390d273288ad1ada1e826669c45ad088bbc

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, a known vulnerability in Adobe Reader related to the `Collab.collectEmailInfo` function. The exploit stage is recovered by XORing binary digit strings and then evaluated. This indicates the primary purpose is to leverage this specific vulnerability for code execution.

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` `162bac0cb066412d3f1b3d0463d74b35d5075c8d3b365e7d4b30b703aa2c4aad`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78664 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` `8f8961e04e6f2bb4f582325346455d636da6a95dc255e36e2912577243662386`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1312 bytes

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