PDF malware analysis — malicious · 7ff15308d10a376a

MALICIOUS

PDF

9.4 KB

MD5: dd23b74749d537ffb2c06e6dd043983c SHA-1: c35b7515e19915ee46b65440c1d4df12b7e94740 SHA-256: 7ff15308d10a376a665be9c460044662fdb9780c957afc6677010604fd2a7f2e

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and uses the `unescape()` function. Critical heuristics indicate the exploitation of CVE-2007-5659 via the `Collab.collectEmailInfo` method, a known vulnerability for arbitrary JavaScript execution in older PDF readers. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are large and complex, suggesting they are designed to download and execute further malicious content. ClamAV also identified this as Pdf.Exploit.Agent-35905.

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` `5eec53e4995c8404b547cedabc5c5ee87faf0155a35d0152fc9252396d65c35f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12044 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` `22ebfdc837d4d4fd6b353dd6482cb92a840a4353586be9a01015281cf21b052c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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