PDF malware analysis — malicious · 359ab5e0b57da030

MALICIOUS

PDF

693.6 KB Created: 2021-05-06 22:42:29

MD5: a0c7e9dc69e439cb431e6dea9f0d5930 SHA-1: cebaf2bfcf1f2297d18e4d35efb2597adc334513 SHA-256: 359ab5e0b57da0307ca9472e5b225dcd0f9dc9bf2efd2f15b1ca45b78791b6bc

262 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.007 JavaScript T1059.004 Python

The PDF file contains embedded JavaScript that exploits CVE-2020-9715. The script attempts to use memory corruption techniques to achieve arbitrary code execution, specifically targeting the loading of 'kernel32.dll' and calling the 'VirtualProtect' function. This indicates a likely attempt to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9643

Heuristics 11

dataObjects ESObject stale-cache trigger — CVE-2020-9715 critical CVE exact CVE_2020_9715

PDF embeds a file and JavaScript follows the CVE-2020-9715 ESObject use-after-free trigger shape: access this.dataObjects[], clear the dataObjects entry, schedule app.setTimeOut(), then re-access the Data ESObject through toString().
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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 https://adobereview.uservoice.com/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0508_000.js` `c4a8060e2a254739a0951ff988785c715482042a379cf09b2a10399e94c85489`	pdf-javascript-stream	PDF /JS object 508 at offset 0xA870F	10795 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0530_001.js` `8433dca28e2ce9876e690a6c9e5b9bbec7c8d08198b5135ae6f8b7552dfa63f6`	pdf-javascript-stream	PDF /JS object 530 at offset 0xAABB0	6340 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_016_off000070d7.bin` `c11cb8cfdf0f17b6f5f697110384d8318aa875573e0209135047cab5cb5dca38`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x70D7	1833651 bytes
`stream_020_off000328bf.bin` `893a859eca5401895aec6b5e6246124430c51c09df8f8b7ec9aedf153bddbac4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x328BF	1491369 bytes
`stream_026_off00068651.bin` `517710f00acc02ea3199ee20575c9310eb66683b3ba6e3533125ef3de44bc024`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x68651	1102248 bytes
`stream_029_off00077fc9.bin` `104d79a0db2565b1a19b2bc4e2f555d6d5f747d810412824404093e84b169adf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x77FC9	154368 bytes
`generic_stage_recovery_000.js` `f5669e7a74824b92fcd63742bffaa424b4ff5467e1639bcbc1ed22ddc076832e`	deobfuscated-js	generic stage recovery marker-ddd-to-%u from decompressed stream at 0x4560 at offset 0x4560	66589 bytes
`generic_stage_recovery_001.js` `510f28ad59a12d4aa4a02a5cdd60db55b064e3d92d36101cbca77538ac40fe3e`	deobfuscated-js	generic stage recovery marker-ddd-to-%u from decompressed stream at 0x4560 at offset 0x4560	34548 bytes
`font_00_cff_off00088e65.bin` `48350d8ae3f4c835da67d173692f7f7b37cd7562c161a07612770888056393f5`	pdf-font-stream	PDF embedded font (cff) at offset 0x88E65	7926 bytes
`font_01_cff_off0008a7ed.bin` `7fd9973dee0fb1d775fc88c42aa4d0066f3d843e6d95097419c6e27cae457647`	pdf-font-stream	PDF embedded font (cff) at offset 0x8A7ED	2332 bytes

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