PDF malware analysis — malicious · ecd239974f1f0bba

MALICIOUS

PDF

13.0 KB

MD5: e55ceb1a345298aee593306542690dae SHA-1: 9281be17cf2a86b138f83e20fb74cd069c208b02 SHA-256: ecd239974f1f0bbab2669ba4fa890fbe9e676d0d1155b7609dae98a0d9b8dde3

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes the Collab.collectEmailInfo method to exploit CVE-2007-5659. This exploit is designed to download and execute a second-stage payload. The high confidence is due to the critical heuristic firings directly indicating the exploit and the presence of a deobfuscated JavaScript stager.

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` `5fc0fc4e5cd6ec11c8574281ed47fee3221b4a041df9df96495f5de832b52706`	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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