PDF malware analysis — malicious · 886fd40d9f258d33

MALICIOUS

PDF

9.6 KB

MD5: 60a16336b95c551527af95a20a5a379d SHA-1: b2ed28dd938daf640cf30439724c7c7ae65f010b SHA-256: 886fd40d9f258d33b2b52433dc0aef65ee964375d0e61db2f91ff96da117d23d

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics including a critical detection for CVE-2007-5659 (Collab.collectEmailInfo). The embedded JavaScript is heavily obfuscated but appears to be designed to exploit this vulnerability. The ClamAV detection 'Pdf.Exploit.Agent-35905' further confirms its malicious nature. The primary function seems to be the execution of this exploit to potentially download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `5a640c75d798cd8071f61988719269aa8d39cc927ecd21e4c3e501f6b91d0094`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12298 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` `18e996133a49a26f80e394b19fec610b0db0d8f1bded5abe34c98a64b163eb9c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5140 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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