PDF malware analysis — malicious · f56f1571291812c8

MALICIOUS

PDF

13.0 KB

MD5: 7c96589cde841fe69211e50a7593b87b SHA-1: 45ec00c38243ca8f67687328151ddaed512b2e34 SHA-256: f56f1571291812c8a8facadbc6eb2e3556aa54c5f84c0cc7252551795afce47c

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF document contains obfuscated JavaScript that utilizes a binary-XOR stager. This stager is designed to exploit CVE-2007-5659, specifically targeting the Collab.collectEmailInfo function in Adobe Reader. The recovered JavaScript is responsible for decoding and executing a further payload, likely downloaded from a remote source, which is characteristic of a downloader or initial access exploit.

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` `5a9fb895af3f39bc127fb3e6fdb95fb5cabf845c46c36d036a4b29752dcd4528`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76828 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` `0e7047919318a17cd9add93138eeb18c2ab668c0cc989f12ac54e74e7a79526a`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1276 bytes

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