PDF malware analysis — malicious · 1604b4f92dc49f37

MALICIOUS

PDF

9.3 KB Created: 6ûäy°MãÓÚ)åì Authoring application: 7oT¢¶4ò]ÿËÛ4æï (via 7oT¢¶4ò]÷vÅ¤sµ¯ÛnÈÂ>Ô3ëX)

MD5: 21c0f36859399e2cb9ed320f2cac0133 SHA-1: e11dec82b085afad39c2c016f840ba46512db03d SHA-256: 1604b4f92dc49f37aaefeff918bb100b5155ed0d59bdaeb48e6f4bfede6cd085

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file is encrypted and contains JavaScript, which is used to hide a payload. Critical heuristic firings indicate the exploitation of CVE-2007-5659 (Collab.collectEmailInfo) via embedded JavaScript. The deobfuscated JavaScript likely serves to download and execute a secondary payload, a common technique for initial access and further infection.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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)
Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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_obj0024_000.js` `65d5d340e02fb00ec7dce80b5bfd48ce3a5c10ddeab7ca535252f9bfad74f9b2`	pdf-javascript-stream	PDF /JS object 24 at offset 0x1CC1	10271 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).
`generic_stage_recovery_000.js` `d1c2396e23d306e1453614b1dd39818f505cb657af38677d3766f3d31ccc9a62`	deobfuscated-js	generic stage recovery hex-literal-bytes from JavaScript object 24 at offset 0x1CC1	5114 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `c8396c4d74865500fbfd8c850212c031f69da15ca7446e39057037b8a9ba952f`	deobfuscated-js	generic stage recovery hex-literal-bytes -> split-literal-normalize from JavaScript object 24 at offset 0x1CC1	4605 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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