PDF malware analysis — malicious · fb35173642f77abb

MALICIOUS

PDF

9.2 KB

MD5: d23652816a1b91f66358d15f7063d090 SHA-1: 18b292e113767540a27ecf016080935570712e5a SHA-256: fb35173642f77abb4bea6b38fc8ac435cc68c3c6a246e92191beff7f23a4fcc9

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes the `unescape()` function, indicating an attempt to hide malicious code. Critical heuristics identify the use of `Collab.collectEmailInfo` which is associated with CVE-2007-5659, a known PDF vulnerability. The ClamAV detection further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage 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-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` `55fdf2f66b8f435e2c2a540d24661e43759be68389266206664400bcb372402f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11551 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` `04f03338bf037a0bc74ec6d89d4eeee8160dd9e8c4f6ac44f33ee86f2a1bf878`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4843 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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