PDF malware analysis — malicious · c91703a8d9329807

MALICIOUS

PDF

45.4 KB

MD5: 0728dfcc9b309de6e8a9627ecffe2c20 SHA-1: 805be51f2c2785df9e6f7b57ee7d676cdb764c98 SHA-256: c91703a8d9329807f79c2aa12a0bfd28e407939dd3555b564266aa8f09e02c63

154 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

The critical heuristic firing for CVE-2010-2883 indicates exploitation of Adobe Reader. The presence of embedded JavaScript, including a call to unescape(), strongly suggests that the script is designed to download and execute a second-stage payload. The PDF structure also contains XFA forms and AcroForm buttons, which can be used to trigger actions.

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` `08133033b1e9aef727b71eb3e77b29e9d70ec1da3020d19165cad14f2482d445`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	2373 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off0000ac7e.js` `d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xAC7E	1042 bytes
`font_00_sfnt_off00000ec8.bin` `07d9cfe89037b761b2102f9f22f90f53f58af8a5bf0336512914739a2333ceaa`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC8	65932 bytes
`font_01_type1_off0000b122.bin` `c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b`	pdf-font-stream	PDF embedded font (type1) at offset 0xB122	97 bytes
`font_02_type1_off0000b3ab.bin` `b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d`	pdf-font-stream	PDF embedded font (type1) at offset 0xB3AB	144 bytes

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