PDF malware analysis — malicious · d3660bc87ec66241

MALICIOUS

PDF

12.9 KB

MD5: df7c7fb11313fc5e63b7aaba72d88876 SHA-1: 514e4130b88ca3b22e7132eef30642387ac8b139 SHA-256: d3660bc87ec66241007e5c8cc5f6fc9a6e974e4a799ce03da5acc0af01a390e9

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that leverages 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` `aeee2122e76832c7b6a0b0e725105c14a4178f0bec39890e1fedce39dd9bbd61`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76648 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` `e3d22a61ca9a745d0033eb8b536fee211344b43ec2d2ade9f0edb73dc7cc300b`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1270 bytes

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