PDF malware analysis — malicious · 12b99d4f02abd297

MALICIOUS

PDF

164.6 KB

MD5: 4d37cecbb324c07d154e202f83ee55fc SHA-1: 9d7aaad403f7468ef8012a6a1c8372c966ec4339 SHA-256: 12b99d4f02abd297d77793df7c236855dc9a5719ccdb340ac06091215a394e08

286 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple critical heuristic firings indicating JavaScript exploits, specifically targeting CVE-2010-2883 (Adobe Reader CoolType SING font exploit). Embedded JavaScript streams were extracted, and one of them, 'javascript_obj0029_000.js', appears to be a deobfuscated exploit stage that likely downloads and executes further malicious content, potentially including the embedded '5.swf' file. The presence of XFA forms and ASCIIHexDecode filters further supports the exploit vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 11

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.1/

Extracted artifacts 12

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`5.swf` `060fdfb9be9860ec5821883c5c4e3186f18e916cb89d856e901c00fd683b64ea`	pdf-embedded-file	PDF EmbeddedFile object 50 at offset 0x3C81	22882 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0029_000.js` `77d22524d8a7bd28e243da70090a0076280c23c53cb8751d289f8edbf14d0c2f`	pdf-javascript-stream	PDF /JS object 29 at offset 0x26F0F	19428 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`javascript_obj0038_001.js` `2c0b66ec50073178ddc3de2aaf0627ef83819a8f71c118ff3b075b4bd82749fe`	pdf-javascript-stream	PDF /JS object 38 at offset 0x1B7B	1242 bytes
`javascript_obj0039_002.js` `6925014a3c2c6b64ae3000282d91544e3f9bbc49b7fdc6b0421ea04d61e8240a`	pdf-javascript-stream	PDF /JS object 39 at offset 0x2157	3698 bytes
`javascript_obj0056_003.js` `fd7d21cf68514556b0343a05f24c2ad1824764617801ef6fe16cc43b30be96d4`	pdf-javascript-stream	PDF /JS object 56 at offset 0x2FFD	1064 bytes
`stream_004_off00000ae5.bin` `69e17a0038b9273e6d005ef52313a832cb41b9cf9713d6134d0cf9f2e59298a7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xAE5	434 bytes
`generic_stage_recovery_000.js` `7ee5599eac51f520ae64788e9be395d43b9228e7db96d7efaaceab13b3e9eaf3`	deobfuscated-js	generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0x26F0F	25397 bytes
`generic_stage_recovery_001.js` `e451571d2ec61ed404d8a2d60b62e5bcc9c5e716b6742b6ada9b45df383d1c2d`	deobfuscated-js	generic stage recovery marker-MM-to-%u from combined JavaScript objects at offset 0x26F0F	19014 bytes
`generic_stage_recovery_002.js` `49cec8ae720746b59ef78e45224c76dfe66df49eb7c31ef74787c504bd920a53`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-MM-to-%u from combined JavaScript objects at offset 0x26F0F	25391 bytes
`generic_stage_recovery_003.js` `4e79082bbf60dd2a7da1dad2e25a0ac70d45eb5c1d902f3a8f9167bb17fc7457`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-MM-to-%u from combined JavaScript objects at offset 0x26F0F	19008 bytes
`font_00_sfnt_off0000114b.bin` `fc85f44193ccd402987935418c4f5fdf6802c96450b789e7fce04f9791933021`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114B	7965 bytes
`font_01_sfnt_off000018fc.bin` `1e827515a464087cdace63e3578c118b45a657ed40cdbb9de7eead35c9b593ba`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18FC	7965 bytes

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