PDF malware analysis — malicious · f7b99edb2b6d00cd

MALICIOUS

PDF

9.4 KB

MD5: 8ea27f1d8ca32e09abfa8a25bf1a1224 SHA-1: 6a8b48d2c6d1020c442326ae729a0ff1481e45b2 SHA-256: f7b99edb2b6d00cd19168270f307008a4befe29d0a495b17b3c21e418dd35cfd

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 flagged as malicious by ClamAV (Pdf.Exploit.Agent-35905). The critical heuristic CVE_2007_5659 indicates the use of a known exploit targeting Adobe Reader's Collab.collectEmailInfo function. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are large and show obfuscation, suggesting they are designed to download and execute a second-stage payload. The presence of multiple JavaScript files and the specific exploit points to a downloader or dropper functionality.

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` `9e66055302a9f7226f1a47b1b47510f4d18096c1ebeaad33df4f949a37c905f3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11833 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` `fbe0dfaed48d725f5e3d848210bef9ededd15f4e78946fec1ff2fb83cacc524e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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