PDF malware analysis — malicious · abe51d6125e134a9

MALICIOUS

PDF

9.6 KB

MD5: 3fad83372ea5bfecbf0699d4eb5cf9de SHA-1: 1ca2860b5e9dcb98ea55adb6c7b2f9cc956a1df5 SHA-256: abe51d6125e134a9cdd5863b2d141cc10134a10d2cdcdce3e978992724783639

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link T1071.001 Web Protocols

The file is a PDF containing embedded JavaScript, as indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. Critical heuristics identify the use of CVE-2007-5659 (Collab.collectEmailInfo) and a ClamAV detection signature (Pdf.Exploit.Agent-35905). The JavaScript is heavily obfuscated and decoded using unescape(), suggesting it is designed to download and execute a second-stage payload. The presence of deobfuscated JavaScript streams further supports this. The attack pattern is consistent with exploiting PDF reader vulnerabilities to deliver malware.

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` `96608029cdab3e7ed333798efc08f710d399c63e7b828004c41343b5c648ad07`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12391 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` `daa09dca6cbc411f1f31cd65dca5a223f04ed43ae5a0122b460ddc0ae24f67cf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5176 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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