PDF malware analysis — malicious · 96c014f16d0d383a

MALICIOUS

PDF

8.1 KB

MD5: 0c9d7fa2bd6376a558786466b32d41b1 SHA-1: 50a461974da9c2c5e428dd6bafbab527ac523377 SHA-256: 96c014f16d0d383a0fb70f0f0fc5fe6b93ab9c0898e0bf7b96e6682e83bea55f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2007_5659 firing specifically points to the use of Collab.collectEmailInfo to execute decoded JavaScript, which is a known vulnerability for arbitrary code execution in older PDF readers. The deobfuscated JavaScript streams suggest complex scripting, likely intended to download and execute a second-stage payload. No specific family could be identified due to the generic nature of the exploit.

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `fb6ff05f2894d2886a0fd98b2815eb2430dc2861f4ebcdad696c70c3577a8407`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `91145961d42930976d0220228ce5568de90338a1c3d8f759cd82c41311afeea8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AE9	1884 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `29680ac7ae8e436435c9b3f832c5ae43be0e5f1079a681f99c7f0bcbc5895764`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x35B	5076 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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