PDF malware analysis — malicious · 40b4b314cd834a66

MALICIOUS

PDF

41.2 KB

MD5: c5d13d55025bf0d8fd008ee558ef42d3 SHA-1: 11420f8c4c120b55750b507d8c55e335c6897c45 SHA-256: 40b4b314cd834a663e61417a1680a80c93f9eeb7d442cfabf0124e3fc7f9da66

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious JavaScript T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript that exploits the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. The JavaScript is obfuscated using a character-table stager, which reconstructs and evaluates the malicious code. This technique is commonly used to download and execute further malicious payloads, indicating a downloader or exploit kit.

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` `89a5c14ce5bd353e11c8b2b9414c4aa7191b91b5f15e334b12b5a42cf0191e13`	deobfuscated-js	char-table indexed JavaScript (raw) at offset 0x348	2590 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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