PDF malware analysis — malicious · 486420ffd8530caf

MALICIOUS

PDF

13.3 KB

MD5: c687f41f6233f0927be17d797c85848c SHA-1: 09579bbb456a9456b6c4ba848ef1d8b1ae70993a SHA-256: 486420ffd8530caf4c2b503ce7880e6505d28e48812732c20defb093131f1934

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that utilizes a binary-XOR stager. This stager is designed to exploit CVE-2007-5659 by leveraging the Collab.collectEmailInfo method. The exploit stage is recovered and evaluated, indicating the likely intent is to download and execute a second-stage payload from a remote source. The ClamAV detection and heuristic firings strongly support this analysis.

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` `503c2c9ccd7c9c55da1f5bd24991a5851031382859658a4dd931d04c2a3e2b24`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78844 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` `c1d0b40f07e054d1db24581f00b7eeec28d48f6fbe241be1cc149f33d34baa19`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1318 bytes

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