PDF malware analysis — malicious · 1877e890094bbfe5

MALICIOUS

PDF

45.9 KB

MD5: 41c2b53dcbf3343addf35c3e981e93e6 SHA-1: dd6693beef64ed45186c74515d9d147b78ec1376 SHA-256: 1877e890094bbfe5ddb8d5065f4c08ea95ea357e775692ff0cebb4a88877686f

286 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages the CVE-2010-2883 vulnerability in Adobe Reader. The JavaScript uses unescape() to decode a shellcode payload, indicating an attempt to execute arbitrary code. The presence of generic stage recovery scripts further suggests that this PDF acts as a downloader for a subsequent malicious payload. The benign URLs related to XFA and Adobe are likely present due to the XFA form structure, not malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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.
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.
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.
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://www.bitstream.com
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/3.0/
- http://www.xfa.org/schema/xfa-template/3.0/
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `ca22018c97061ca4a76b7e56bbbcf0efcce760def689bc14237ac441db971fa6`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	2790 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off0000ae25.js` `d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xAE25	1042 bytes
`generic_stage_recovery_000.js` `52d226e22a7b98acb28d271ea344a1a9b3ddfd004d670d839f58447bd5e0025f`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 1 at offset 0xA	2740 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `8a02262d126811ecd54b3abf39ab7e056aae444904c667d048a4e6fa68ad21d5`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x0 at offset 0x0	46910 bytes
`generic_stage_recovery_002.js` `0e1d14f9e37fb7ac0228bbbe4ebabead3beb1fee4093904b575dc8c2df90f25e`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from decompressed stream at 0x0 at offset 0x0	46908 bytes
`font_00_sfnt_off0000106a.bin` `fdf6ca548282fa5b8d6c71b1f84e95ee1b778da1f01feaea18bd7ec33cafda76`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106A	65932 bytes
`font_01_type1_off0000b2c9.bin` `c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b`	pdf-font-stream	PDF embedded font (type1) at offset 0xB2C9	97 bytes
`font_02_type1_off0000b552.bin` `b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d`	pdf-font-stream	PDF embedded font (type1) at offset 0xB552	144 bytes

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