PDF malware analysis — malicious · 22ebc79545c0a334

MALICIOUS

PDF

33.7 KB

MD5: eea3d8a8570200790c67746e8b5424c0 SHA-1: a3c85c34d9ed4f85f23771d9a03afe92e2a5fe53 SHA-256: 22ebc79545c0a33410c0d6bb8322e7a948c14c920bc7016e4ee217e62218853f

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes a character table for obfuscation, a technique commonly used to hide malicious code. The critical heuristic 'CVE_2007_5659' specifically identifies the Collab.collectEmailInfo vulnerability, indicating the sample is designed to exploit this known flaw. The deobfuscated JavaScript is likely responsible for downloading and executing a secondary payload.

Heuristics 6

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: Pdf.Exploit.Agent-36395 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36395
Character-table JavaScript eval stager high PDF_JS_CHAR_TABLE_EVAL_STAGER

PDF JavaScript reconstructs an exploit stage by indexing into a small character table, appending hundreds of one-character fragments, joining the array, and evaluating the result. This static fallback fires only after the bounded decoder recovers an exploit-like stage, so it catches this obfuscation even when no single CVE API signature is available.
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`char_table_stage_000.js` `e6c82a6501a6e1ee5b945b10bf73f61416c5e814343fe2062007fd1444394947`	deobfuscated-js	char-table indexed JavaScript (raw) at offset 0x344	2411 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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