PDF malware analysis — malicious · fd897b6a63aa6e89

MALICIOUS

PDF

9.7 KB

MD5: f86860c60ee7417d3835ee4c36eaca67 SHA-1: a327a5c60154a2d3e16a6443453c796e418d729d SHA-256: fd897b6a63aa6e8926cf75083dfda5df443e54f8a44ff86de4b656e5fb5bc701

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is flagged by multiple heuristics. Specifically, the 'CVE_2007_5659' heuristic indicates the use of the Collab.collectEmailInfo method to execute JavaScript, a known vulnerability. The PDF launcher concatenates info fields, extracts characters at a fixed stride, and evaluates the result. ClamAV also detected this as 'Pdf.Exploit.Agent-35905'. No document body text was available for analysis, but the presence of JavaScript and the specific exploit technique strongly suggest malicious intent.

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` `b7e60e7e199c9541fc663d4675ca58437444841c537d2e1bf5e3776123f2fafb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12349 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` `abdb041b915d3f4d210cf50e22312a2badb0bbdbab9ee4c453f6ce6a730c5cdf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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