PDF malware analysis — malicious · feb31ee8116bfe22

MALICIOUS

PDF

9.0 KB

MD5: dfeb212e16135d430ba2c4a4095cc801 SHA-1: 0936872017f09096410b5d9a0136f5fd3465610f SHA-256: feb31ee8116bfe22d28e25534e6eccb5e6b9d74c373eb3bba575df5f36dc4a33

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF document that exploits CVE-2007-5659, a known vulnerability related to the `Collab.collectEmailInfo` function. This exploit is used to execute embedded JavaScript. The JavaScript streams are heavily obfuscated, but the presence of `unescape()` and the nature of the exploit suggest the script is designed to download and execute a second-stage payload. The ClamAV detection of 'Pdf.Exploit.Agent-35905' further confirms its malicious nature.

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` `48b48d5856c75036bb3687e42ebc5d63a8ee17ca8d2efed972e9f5a3ebbc077b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11798 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` `abec3ab160182425fb3910eb43ad14a5114b5935ff2a37661744c4487c9752fb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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