PDF malware analysis — malicious · b746f70381e1ea7f

MALICIOUS

PDF

9.7 KB

MD5: a4b07c987e87d96f5fa05745d5576ac1 SHA-1: f318266ba74555f70f4cc1ead0ef39440d5d86a1 SHA-256: b746f70381e1ea7ff7d94737df61cc9e2ba2f66e1c7db484ca48709f172c4301

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and utilizes the unescape() function. Critical heuristics indicate exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, a known technique for executing arbitrary code within PDF documents. The ClamAV detection further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the heuristic firings and the nature of the exploit.

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` `0fe79c4e3289573221bcafe4ba0c1d6f49ae48cbb4be75de2da619b3add3c231`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12230 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` `8ab70d5a92b3fe793418af222bfda2f05cee47ef6c76bdba6ab068ebf256515c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5185 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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