PDF malware analysis — malicious · b5a325ec2e942a70

MALICIOUS

PDF

45.6 KB

MD5: 1d10fb6602236a04764911921d6e7257 SHA-1: 309b234e0e32c7452df06f9ed74831e9fea1e577 SHA-256: b5a325ec2e942a7046ed85d16ed9c8ab8f75a7d12e56523e3453579724283e7b

184 Risk Score

Malware Insights

This PDF file is flagged as malicious by a machine learning classifier and exhibits multiple heuristic warnings, including the critical CVE-2010-2883 exploit for Adobe Reader. Embedded JavaScript actions and streams were detected, indicating the file attempts to execute code. The presence of the CVE-2010-2883 exploit suggests a direct vulnerability exploitation vector. The ML classifier's high score further supports the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 8

Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883

PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `0298e66c814b963416f55a41efd3a94f5ee829838eea61c3261c29acaa813512`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	2528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off0000ad1b.js` `d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xAD1B	1042 bytes
`font_00_sfnt_off00000f61.bin` `8a11855282414a3349b3707347a33d08c02272692fb6c0a21f93920d8261f8bd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF61	65932 bytes
`font_01_type1_off0000b1bf.bin` `c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b`	pdf-font-stream	PDF embedded font (type1) at offset 0xB1BF	97 bytes
`font_02_type1_off0000b448.bin` `b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d`	pdf-font-stream	PDF embedded font (type1) at offset 0xB448	144 bytes

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