PDF malware analysis — malicious · e3e645a6e9f5e92c

MALICIOUS

PDF

13.4 KB

MD5: 55e00dfc7b8efc9e7bf623dcf4725177 SHA-1: 80ae4a7679fdc14ae04437c7850ab15a34dc46fa SHA-256: e3e645a6e9f5e92c90d6eb71e06e9d666054732d513bf429ed0b291ba6b67486

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified as a stager for CVE-2007-5659. This stager is designed to exploit a vulnerability in Adobe Reader, likely to download and execute a secondary payload. The use of binary-XOR encoding and string concatenation within the JavaScript indicates a deliberate attempt to evade detection. The ClamAV heuristic also flags the file as malicious due to obfuscated objects.

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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `92cc2e136522748a6bf9e5275106a9fa15bb5344639a160f0360862e31f123fa`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79708 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` `000a9df8d8ad61a604a23653f7e52c30bd502e4f597c529427fdb2ab52f08e24`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1336 bytes

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