PDF malware analysis — malicious · f553ff77da976c21

MALICIOUS

PDF

74.3 KB

MD5: 445abc94f7099d90010c47304a4f7c46 SHA-1: 5f84a0a6670216ef95fc1a378201a40bcd07f98f SHA-256: f553ff77da976c21e4ec5d11393afd3a12a23ea5474bf04cf8b07edaed441c0b

276 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes a binary-XOR stager to decode and execute a second-stage payload. The critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo) indicates exploitation of a known Adobe Reader vulnerability. The deobfuscated JavaScript is responsible for downloading and executing further malicious content, as evidenced by the 'binary_xor_stage_000.js' artifact.

Heuristics 8

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.Dropper.Agent-7324142-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7324142-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `d635b20b30607190cb620c6b61b06dddb650ae96945d59a6931eb244de22eb1b`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	75706 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `e3befa633cdc2e029834535f47d1027ce5aa7702bda18252600be2b2ae76328e`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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