PDF malware analysis — malicious · 23b9b8cec51a249f

MALICIOUS

PDF

9.2 KB

MD5: 9f23f0b07eaca504000713bc39f097d8 SHA-1: ca88795c1f9eb46878cf88ef81ed93997f3a5d6a SHA-256: 23b9b8cec51a249fbe289c18de7aad5a0950af5cabd450209b2a6011a45c6145

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and utilizes the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo function. This technique is commonly used to download and execute further malicious content. The presence of multiple deobfuscated JavaScript files indicates a complex, multi-stage attack. The ClamAV detection further supports the malicious nature of the file.

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-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0007_000.js` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `96f659ee54cba202034de2b010a0529c4d671cde1f04e4b8dfdebe3ddc2da85a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11721 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1973029801081aab9621ec8ac122a6fa5ac4152065b77c864f784e1a4006d421`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4961 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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