PDF malware analysis — malicious · 50f888b1a82a2a81

MALICIOUS

PDF

9.4 KB

MD5: ad9a4d11fec4619009c877f3ce7a7c33 SHA-1: 5a745ec07e8982ef02cd4374bc5eea3f62829d11 SHA-256: 50f888b1a82a2a81c9557e9a8ff3237ade19aa53439c431ec3b06bfea1fa0795

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a vulnerability in PDF viewers using the Collab.collectEmailInfo method. This is further supported by multiple JavaScript-related heuristics and the detection by ClamAV as Pdf.Exploit.Agent-35905. The embedded JavaScript streams are highly obfuscated, but the primary intent appears to be the execution of malicious code, likely for downloading further stages.

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` `6b733da80eff6fb2d55270bd9214968244db3ca0d83bd7f11190b2fd6d5c927b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11930 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` `c25c256196c20e561f8a3829cbab346774b1579c6e289c7193b6d7c738399694`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5030 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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