PDF malware analysis — malicious · 56055048717f23ad

MALICIOUS

PDF

9.6 KB

MD5: 78fc143562ad4392cf9615adb796878a SHA-1: 253f83a118c3761b3f0d36ca1d416d4fbb5a9fd9 SHA-256: 56055048717f23add809a1165ceaeb776582975042a0d7a9bd9467d841db33fd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and designed to act as a stager. The critical heuristic CVE_2007_5659 indicates the exploitation of a known vulnerability (Collab.collectEmailInfo) to execute this JavaScript. The JavaScript is then used to download and execute a second-stage payload, as evidenced by the large deobfuscated.js file and the PDF_JAVASCRIPT heuristic. The attack pattern is consistent with a malicious PDF dropper.

Heuristics 6

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `b290988d4ad03094c49552cd6dd20ee15857487f4858c312a668ae5b5e2e75e9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5234 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `42435eb3206a31c244cf69b0e11ca747d26d4e0449ba49b365ef4b06ab9a43fd`	deobfuscated-js	PDF JavaScript deobfuscation pass	74356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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