PDF malware analysis — malicious · 9530d85b36f37075

MALICIOUS

PDF

13.4 KB

MD5: 064ad4f011345fc49dd74e0037959a0e SHA-1: 5e4bc5860a1a24ceb1f73b609a6e4a2f5e7e241e SHA-256: 9530d85b36f37075dbbeda472da43d9ae19c767c64fd3504e25fefdbcc302a5f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF exploits CVE-2007-5659 using a binary-XOR obfuscated JavaScript stager. This stager is designed to decode and execute further malicious JavaScript, likely leading to the download and execution of a second-stage payload. 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.
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` `7c188e0281d0cd11fbb130f29c1780ca35e8be4ff491481c0e8049381641a2f4`	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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