PDF malware analysis — malicious · 385ebcbf07a01fb2

MALICIOUS

PDF

9.3 KB

MD5: c7e927f11e99ba9e9e5dbafd3fd5fa01 SHA-1: 6ca2c3b4000a2ef88dc7eb91778d9a39c3bd64c4 SHA-256: 385ebcbf07a01fb249c6fbefc5bd1237d54b148cab687f6fed2f982d7c764682

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is a common delivery mechanism for exploits. Heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) and JavaScript unescape functions, suggesting an attempt to exploit a known PDF vulnerability. The ClamAV detection further confirms its malicious nature. The embedded JavaScript is heavily obfuscated, but the presence of multiple deobfuscated JS files indicates a complex execution chain, likely involving 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` `887c0ae3a92107fc927c3d19a1a7654767d21fcb5cd49bd5734029f7fc23a301`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11947 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` `0ea57a64ad8195ce77f4c8f3849da6da7b2c5b4a0d35706c78ac0ef5730c399e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4969 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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